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Remember to always properly document the sources you have used to write your essay; failure to do so can result in academic penalties. For further information see Section VII - Academic Regulations and Policies in the Course Calendar.
The Publication Manual of the American Psychological Association, Seventh Edition is the official source for APA Style. With millions of copies sold worldwide in multiple languages, it is the style manual of choice for writers, researchers, editors, students, and educators in the social and behavioral sciences, natural sciences, nursing, communications, education, business, engineering, and other fields.
"... covers the essential information students need for college research assignments in any discipline." (publisher's description). Including help with in-text citations and reference lists.
The Chicago Manual of Style has been prepared with an eye toward how we find, create, and cite information that readers are as likely to access from their pockets as from a bookshelf. It offers updated guidelines on electronic workflows and publication formats, tools for PDF annotation and citation management, web accessibility standards, and effective use of metadata, abstracts, and keywords.
Publication Manual of the American Psychological Association by 
The Chicago Manual of Style by