If you are quoting directly from the encyclopedia into the body of the text, you will need to include the title of the article, the year it was published and the page number. For example, "According to the Britannica Encyclopedia (2002), 'Horses can develop sand colic by eating grain or hay on dirt floors' (p. 199)." Place the date and the page number in parentheses and the final period outside both the quotation marks and the parenthesis. When naming an exact article, use quotation marks around the title.
Place a direct quote from the encyclopedia longer than 40 words into a free-standing block of text. Remove any quotation marks and start the quotation on a new line, indented 1/2 inch from the left margin. The entire parenthetical quotation should be indented and double-spaced.
You must include a reference list at the end of a paper written in APA style. According to the APA style website, "The purpose of a reference list is to help readers find the sources you used. Therefore, the reference list should be as accurate and complete as possible." List the references in order by the author's surname, or, in the case of an encyclopedia, by the editor's surname.
Reference an encyclopedia in the reference list by listing the name of the editor, the year the article was published, the title of the article, the name of the encyclopedia, the volume number and page numbers as well as location of publication. The following example appears on the Purdue OWL website:
Bergmann, P. G. (1993). Relativity. In The new encyclopedia britannica
(Vol. 26, pp. 501-508). Chicago, IL: Encyclopedia Britannica.
Second and third lines should be indented 1/2 inch.