When citing articles in a reference book, you generally follow the same format as you would for a work in an anthology.
However, you do not need to supply full publication information for well-known reference books in your Works Cited list. Instead, you need only include the edition, publication year, and medium (see general format 2 and example 2).
General Format 1
(Author Surname page number)
Author Surname, First Name. "Title of Article." Book Title: Subtitle.Ed.
Editor First Name Surname. Edition [if available].
Vol. volume # [if available]. Place of Publication: Publisher, Year.
Example 1 (Signed Article)
Shehan, Constance L. “Parental Roles.” Encyclopedia of Sociology.
Ed. Edgar F. Borgatta and Rhonda J.V. Montgomery. 2nd ed.
Vol. 3. New York: Macmillan, 2000. Print.
General Format 2 (for well known reference works)
("Title of Article" [if no author is given])
"Title of Article." Book Title: Subtitle. Edition. Volume. Publication Year. Medium.
"Denial." Merriam-Webster's Collegiate Dictionary. 11th ed. 2003. Print.