This document provides guidelines for citing sources in a paper for the class BIOL 235 – Disease and the Developing World. It discusses using both author-date and numbered in-text citation formats and provides examples. Strategies are described for using sources for background information, as examples, to criticize or analyze a source, and to compare sources. Best practices are outlined for how often to cite sources, using quotations, and what does and does not need to be cited. The works cited section should list sources in alphabetical order for author-date citations or numerical order for numbered citations.