CSE, or Council of Science Editors, is used in the discipline of biology. However, your professor may have you use APA style or another style that undergraduate students may be more familiar with. When citing for a class, the most important considerations are to be consistent within a style and follow instructions from your professor. Both CSE and APA style guides are listed below.
Scientific Style and Format by
Publication Manual of the American Psychological Association by 
Publication Manual of the American Psychological Association by
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