NOTE: This article is based on research that utilizes the sources cited here as well as the collective experience of the Editorial Review Board. This article is periodically reviewed by the Editorial Board and may be updated as a result of the review. Any new sources cited will be added to the list and distinguished from the original sources used. To access online sources, copy and paste the URL into your browser.

Centers for Disease Control and Prevention (CDC). Chronic Fatigue Syndrome Awareness Day. Available online at http://www.cdc.gov/Features/cfsawarenessday/. Accessed October 2016.

CDC. Chronic Fatigue Syndrome. Available online at http://www.cdc.gov/cfs/general/index.php. Accessed October 2016.

CDC. Chronic Fatigue Syndrome. The 1994 Case Definition. Available online at http://www.cdc.gov/cfs/case-definition/1994.html. Accessed October 2016.

CDC. Chronic Fatigue Syndrome. Diagnosis. Available online at http://www.cdc.gov/cfs/diagnosis/. Accessed October 2016.

CDC. Chronic Fatigue Syndrome. Patient Examination Process for CFS. Available online at http://www.cdc.gov/cfs/diagnosis/step-6.html. Accessed October 2016.

Feb. 16, 2016. CDC Public Health Grand Rounds: Chronic Fatigue Syndrome: Advancing Research and Clinical Education. Available online at https://www.cdc.gov/cdcgrandrounds/pdf/archives/2016/feb2016.pdf. Accessed October 2016.

Nov. 13, 2015. Healthline. CFS (Chronic Fatigue Syndrome). Available online at http://www.healthline.com/health/chronic-fatigue-syndrome#Overview1. Accessed October 2016.

December 2015. The Lancet Psychiatry. Rehabilitative treatments for chronic fatigue syndrome: long-term follow-up from the PACE trial. Available online at  http://thelancet.com/journals/lanpsy/article/PIIS2215-0366(15)00317-X/fulltext. Accessed October 2016.

(February 10, 2015) National Academy of Medicine. Beyond Myalgic Encephalomyelitis/Chronic Fatigue Syndrome: Redefining an Illness. Available online at http://www.nationalacademies.org/hmd/Reports/2015/ME-CFS.aspx. Accessed November 2016.

Thomas, Clayton L., Editor (1997). Taber's Cyclopedic Medical Dictionary. F.A. Davis Company, Philadelphia, PA [18th Edition].

Pagana, Kathleen D. & Pagana, Timothy J. (2001). Mosby's Diagnostic and Laboratory Test Reference 5th Edition: Mosby, Inc., Saint Louis, MO.

Klein, J., Reviewed (2002 June, Reviewed). KidsHealth for Parents, The Nemours Foundation [On-line information]. Available online at http://kidshealth.org/parent/system/ill/cfs.html.

Hanna, E. (2002 September, Reviewed). Chronic Fatigue Syndrome. What is Chronic Fatigue Syndrome (CFS)? 4woman.gov, The National Women's Health Information Center [On-line information]. Available online at http://www.4woman.gov/faq/cfs.htm.

About CFID. CFIDS (Chronic fatigue and immune dysfunction syndrome) Association of America [On-line information]. Available online at http://www.cfids.org/about-cfids/symptoms.asp.

(2003, September 18, Reviewed). Chronic Fatigue Syndrome. CDC, National Center for Infectious Diseases [On-line information]. Available online at http://www.cdc.gov/ncidod/diseases/cfs/info.htm.

(2003 September 18, Reviewed). The Revised Case Definition (abridged version). CDC, National Center for Infectious Diseases [On-line information]. Available online at http://www.cdc.gov/ncidod/diseases/cfs/defined/defined2.htm.

(2003 February, Updated). Chronic Fatigue Syndrome. Familydoctor.org [On-line information]. Available online at http://familydoctor.org/x1598.xml.

Craig, T., and Kakumanu, S. (2002 March 15). Chronic Fatigue Syndrome: Evaluation and Treatment. American Family Physician [On-line journal]. Available online at http://www.aafp.org/afp/20020315/1083.html.

(2001 January). Chronic Fatigue Syndrome. NIAID [On-line information]. Available online at http://www.niaid.nih.gov/factsheets/cfs.htm.

(2003 September 23). Aetna Clinical Policy Bulletins [On-line information]. Available online at http://www.aetna.com/cpb/data/PrtCPBA0369.html.

Chronic fatigue syndrome. AccessMed Health Information Library [On-line information]. Available online at http://www.ehendrick.org/healthy/.

Carter Batiste, L. and Loy, B. (2003 November 05). Accommodating People With Chronic Fatigue Syndrome. Job Accommodation Network [On-line information]. Available online at http://www.jan.wvu.edu/media/cfs.html.

Mayo Clinic staff (2003 October 02). Chronic fatigue syndrome. MayoClinic.com [On-line information]. Available online at http://www.mayoclinic.com/invoke.cfm?id=DS00395.

Kova, B. (2002 April 25). MedlinePlus Health Information Medical Encyclopedia [On-line information]. Available online at http://www.nlm.nih.gov/medlineplus/ency/article/001244.htm.

(2003 October 14, Updated). Chronic Fatigue Syndrome Bytes. National Jewish Medical and Research Center [On-line information]. Available online at http://nationaljewish.org/cfsbytes.html.

Chronic Fatigue Syndrome. Merck Manual – Second Home Edition [On-line information]. Available online at http://www.merck.com/mrkshared/mmanual_home2/sec25/ch306/ch306b.jsp.

McLaughlin, Jill. Understanding Chronic Fatigue Syndrome. Co-Cure [On-line information]. Available online at http://www.co-cure.org/Understanding%20Chronic%20Fatigue%20Syndrome.htm.

Davis, C. What's in a Name: Fibro vs. CFS. Arthritis Foundation [On-line information]. Available online at http://www.arthritis.org/resources/news/news_fibro_cfs.asp.

(2006 May 9). Chronic Fatigue Syndrome, For Patients, Caregivers, Consumers. CDC [On-line information]. Available online at http://www.cdc.gov/cfs/consumers.htm. Accessed on 4/20/08.

(2007 June 22). Chronic Fatigue Syndrome. MayoClinic [On-line information]. Available online at http://www.mayoclinic.com/health/chronic-fatigue-syndrome/DS00395/DSECTION=3. Accessed on 4/20/08.

Christopher-Stine, L. (2006 August 22, Updated). Chronic Fatigue Syndrome. MedlinePlus Medical Encyclopedia [On-line information]. Available online at http://www.nlm.nih.gov/medlineplus/ency/article/001244.htm. Accessed on 4/20/08.

(2006 July 11, Modified). CFS Toolkit for Health Care Professionals: Basic CFS Overview. CDC Chronic Fatigue Syndrome [On-line information]. PDF available for download at http://www.cdc.gov/cfs/pdf/Basic_Overview.pdf. Accessed on 4/26/08.

(Updated June 4, 2007) Centers for Disease Control and Prevention. Chronic Fatigue Syndrome, Possible Causes. Available online at http://www.cdc.gov/cfs/cfscauses.htm. Accessed October 2008.

(2011 June 18) Mayo Clinic Staff. CFS, Risk Factors (Online Information). Available online at http://www.mayoclinic.com/health/chronic-fatigue-syndrome/DS00395/DSection. Accessed September 2012. 

(2011 September 15) Davis, C.P., Balentine, J.R. Chronic Fatigue Syndrome. Medicine Net.com (Online information). Available online at http://www.medicinenet.com/chronic_fatigue_syndrome/article.htm. Accessed September 2012. 

Shiel, W.C Jr., Stoppler, M.C. Chronic Fatigue Syndrome. Emedicinehealth.com (Online information). Available online at http://www.emedicinehealth.com/chronic_fatigue_syndrome/article_em.htm. Accessed September 2012. 

(2012 May 16) Centers for Disease Control and Prevention. Chronic Fatigue Syndrome. CDC.gov/cfs (Online information). Available online at http:// www.cdc.gov/cfs/general/. Accessed September 2012. 

(2012 February 2) Chronic Fatigue Syndrome, pubmed.com (Online information). Available online at http://Ncbi.nlm.nih.gov/pubmedhealth/PMH0002224. Accessed September 2012. 

(October 2011) Carruthers B, et al. Myalgic encephalomyelitis: International Consensus Criteria. Journal of Internal Medicine Volume 270, Issue 4, pages 327–338. Available online at http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2796.2011.02428.x/abstract. Accessed June 2012.