To cite the use of a source in the text of an essay, APA advocates two methods: parenthetical citation and attribution within the essay's content. Parenthetical references should be included immediately after the quotation marks used in direct quotations or immediately after the use of the source, even if these means including the parenthetical reference in the middle of the sentence. The following is the general form for parenthetical citations in APA style:
Check to see if the the PDF is written by an individual, set of authors, or an organization or company. If it is not written by an individual or a set of authors, use the name of the organization or company responsible for creating the PDF in place of the author’s name. Continue with the title of the PDF, version (if there are different versions available), the publisher (only include if the name of the publisher is different than the name of the author or the title), the publication date, and the location (usually a URL if found online).