The Council of Science Editors (CSE) Style Guide outlines different ways to cite sources in a scientific paper, including parenthentical references (similar to APA style) and numbererd citations. CSE style is the successor to the CBE (Council of Biology Editors) style. When citing sources for a paper, follow your instructor's preferences.
The most current copy of this manual is on Reserve in the University Library.
For examples of CSE documentation, see CSE documentation guide at Ohio State University.
The definitive authority for CSE style is only available in print:
Scientific style and format : the CSE manual for authors, editors, and publishers (7th ed.)
Copy available in Library Reserves under the call number: T11 .S386 2006