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The MLA (Modern Language Association) citation format is most commonly used in English and writing assignments from Purdue OWL.

The APA (American Psychological Association) citation format is most commonly used to cite scientific and social science information from Purdue OWL.

The Chicago Manual of Style (CMOS) covers a variety of topics from manuscript preparation and publication to grammar, usage, and documentation, and as such, it has been lovingly dubbed the “editor's bible” from Purdue OWL.

Developed by the American Chemical Society, this style may be used for research papers in the field of chemistry.

Reference page formatting for the American Medical Association (AMA) style sheet. AMA was developed by the American Medical Association for the purpose of writing medical research from Purdue OWL.

Citation Machine provides information on how to properly use both the MLA and APA citation styles to document your use of others' words, ideas and concepts.