The document compares the APA and Chicago citation styles. It notes that APA style is used for subjects related to the social sciences, while Chicago style can be used for any subject matter. It outlines the key differences between the styles, including how author names and publication years are presented in in-text citations, whether footnotes are allowed, how the reference list is formatted, and what citation tools support each style. The document provides examples of in-text citations and reference list entries in both APA and Chicago format.