There are numerous citation styles. Ask your instructor which style you should use and be consistent. Guides for common styles used at Fontbonne are below.
ACS Style (chemistry)
APA Style (psychology, education and other social science disciplines)
Cell Style (biology)
MLA Style - (language arts, cultural studies and other humanities disciplines)
NLM/Vancouver Style (sciences, medicine)
Wiley-Blackwell Style (sciences)