Whenever you quote, paraphrase, summarize, or otherwise refer to the work of another, you are required to cite its source by way of parenthetical documentation. Please do not use footnotes to cite sources. Below are some of the most commonly cited forms of material within the APA style. For other types of documents not exemplified here, please consult the web sites of the American Psychological Association, the Modern Language Association, or Turabian. Hope this helps ! :)