Write the author's name, the year of publication and the page number from which you drew the information in parentheses at the end of a sentence if you do not name the author in the sentence itself. Separate the name, year and page number with commas, and put any end punctuation after the parentheses. Close any quotation marks before the parentheses. For example:
Attachment parenting follows the "seven baby B's" (Sears, 2000, pp. 4-10).
Write the year in parentheses after the author's name if you name the author in the body of the text, then continue to write the rest of the sentence. Write the page number in parentheses at the end of the sentence. For example:
According to Sears (2000), attachment parenting follows the "seven baby B's" (pp.4-10).
Omit the page number if you are citing an entire text and cannot narrow the information source to a few pages. For instance, if you are summarizing the basic methodology and findings of an entire scientific study, you do not need to include page numbers.
Include the last names of both authors whenever you cite a work by two authors. In the body of the paragraph itself, use "and" to separate their names; in parentheses, use an ampersand.
Cite a work by three to five authors by including all of their last names the first time you mention the study. In subsequent citations, write only the first author's last name, followed by "et al."
Cite a work by six or more authors by writing the first author's last name followed by "et al."
Cite an anonymous work by writing the title in place of the author's last name. If the work is a short piece such as an article, chapter or website, put its name in quotation marks; if it is a longer piece such as a book, italicize or underline its name.
Cite a work with an organization as its author by writing the organization's name in place of the author's name. If the organization has a well-known abbreviation, such as WHO for World Health Organization, write the abbreviation in brackets after the first citation and cite it using the abbreviation in subsequent references. For example, a first citation would read:
Mothers who sleep in close proximity to their infants are able to breastfeed them for longer periods of time (American Association of Pediatrics [AAP], 2005).
A later citation would read:
Breastfeeding may lower the risk of breast and ovarian cancer (AAP, 2005).
Cite a work with an unknown publication date by writing "n.d." instead of the year of publication.