This is the citation style recommended by the National Library of Medicine, based upon its Recommended Formats for Bibliographic Citation.

• Homepage
  MedlinePlus [Internet]. Bethesda (MD): National Library of Medicine (US); [updated 2005 Aug 12; cited 2005 August 11]. Available from: http://medlineplus.gov/.

• Health Topic page
  Begin by citing the MedlinePlus homepage, then add information about the topic being cited:
  
  MedlinePlus [Internet]. Bethesda (MD): National Library of Medicine (US); [updated 2005 Aug 12]. Heart attack; [updated 2005 Jul 19; reviewed 2005 May 4; cited 2005 Aug 12]; [about 2 p.]. Available from: http://www.nlm.nih.gov/medlineplus/heartattack.html

• Drug Information from MedMaster
  Begin by citing MedMaster, then add information about the drug being cited:
  
  MedMaster Patient Drug Information [Internet]. Bethesda (MD): American Society of Health-System Pharmacists, Inc.; ©2004. Protriptyline; [updated 2005 Aug 4; cited 2005 Aug 12]; [about 5 p.]. Available from: http://www.nlm.nih.gov/medlineplus/druginfo/medmaster/a604025.html

• Herb and Supplement Information from Natural Standard
  Begin by citing Natural Standard, then add information about the entry being cited:
  
  Natural Standard: the authority on integrative medicine [Internet]. Cambridge (MA): Natural Standard; ©2005. St. John's wort (Hypericum perforatum L.); [updated 2005 Sep 1; cited 2006 Feb 1]; [about 10 p.] Available from: http://www.nlm.nih.gov/medlineplus/druginfo/natural/patient-stjohnswort.html

• Encyclopedia
  Begin by citing the A.D.A.M. Medical Encyclopedia, then add information about the entry being cited:
  
  A.D.A.M. Medical Encyclopedia [Internet]. Atlanta (GA): A.D.A.M., Inc.; ©2005. Nail abnormalities; [updated 2005 Apr 30; cited 2005 Aug 12]; [about 4 p.]. Available from: http://www.nlm.nih.gov/medlineplus/ency/article/003247.htm

• Dictionary
  Begin by citing the dictionary, then add information about the term being cited:
  
  Merriam-Webster Medical Dictionary [Internet]. [Springfield (MA)]: Merriam-Webster, Incorporated; ©2003. Phagocytosis; ©2003 [cited 2005 Aug 12]; [about 2 screens]. Available from: http://www2.merriam-webster.com/cgi-bin/mwmednlm&book=Medical&va=phagocytosis.

• News articles
  New articles are provided by HealthDay and Reuters Health. The sample citations use Reuters Health stories.
  
  
  • Signed article Begin with the author and title of the news item, then add information about the news organization/provider:
    
    Boggs W. Therapy for depression can help minority women [Internet]. [New York]: Reuters; 2005 Aug 9 [cited 2005 Aug 12]. [about 2 screens]. Available from: http://www.nlm.nih.gov/medlineplus/news/fullstory_26229.html
    
    
  • Unsigned article Begin by citing the news organization/provider, then add information about the news item being cited:
    
    Reuters Health Information [Internet]. [New York]: Reuters; ©2005. Asthma may increase stroke risk; 2005 Aug 9 [cited 2005 Aug 12]; [about 1 screen]. Available from: http://www.nlm.nih.gov/medlineplus/news/fullstory_26231.html