American Chemical Society (ACS): for chemistry and ACS publications
American Medical Association (AMA): for medicine, primarily used for the Journal of the American Medical Association (JAMA)
Check out Purdue's Online Writing Lab (OWL) for AMA format: https://owl.english.purdue.edu/owl/section/2/66/
Citation Format for Reference List
Last name First Initial. Title of article. Title of Journal. Year; Issue number: page number-page number.
Cunningham TD, DeShields SC. Factors associated with the accuracy of self-reported osteoporosis in the community. Rheumatology International. 2016;12:1633-1640.
For free online access/PDF to the ACS Style Guide: http://pubs.acs.org/isbn/9780841239999
Citation Format for In-Text Citations
American Chemical Society (ACS) allows 3 ways to cite in-text:
Superscript numbers:
During the air autoxidation of benzaldehyde catalyzed by cobalt and bromide, the solution oscillates between pink
and dark brown.3
Italic numbers:
During the air autoxidation of benzaldehyde catalyzed by cobalt and bromide, the solution oscillates between pink
and dark brown (3).
Parentheses:
During the air autoxidation of benzaldehyde catalyzed by cobalt and bromide, the solution oscillates between pink
and dark brown (Jensen, 1983).
Citation Format for Reference List
Periodicals (journal articles):
Last name, first name initials. Title of Article. Title of Journal Year, Volume number (issue number), page number-page number.
Jensen, J. H. New Type of Oscillating Reaction: Air Oxidation of Benzaldehyde. J. Am. Chem. Soc 1983, 105 (9), 2639–2641.
Books:
Last name, first name initials. Chapter Title. Title of Book, Edition number; Publisher: Place of Publication, Year; Volume number, pages.
Stillman, J. M. The Story of Alchemy and Early Chemistry; Dover Publications: New York, 1960.