The way citations are written often depends on the discipline. Many use MLA (English), APA (psychology or nursing) or Chicago style (history), which are found at https://owl.english.purdue.edu/owl/. These handbooks are also in Reference if one needs a more detailed point explained.
Biology uses Scientific style and format : the CBE manual for authors, editors, and publishers, available in Reference: T 11 .S386 2006.
Chemistry uses The ACS style guide : effective communication of scientific information. Located in Reference QD 8.5 .A25 2006.
IEEE has a citation guide at http://www.ieee.org/documents/ieeecitationref.pdf
Others include the AMA Manual of Style, for medicine, located at the McNichols and Dental Libraries. R 119 .A533 2007 and the Associated Press Stylebook: PN 4783 .A83 2002