For citations in the text include the last name(s) of the author(s) and publication year. Include page numbers when directly quoting.
If the author's name is in the text:
In another study by Smith (1989) she concluded that...
Author and date not cited in text:
Inequality is now geographical rather than soley class based (Smith 1989).
Direct quotation with name of author:
Kuhn (1989:14) wrote "sociology must address the..."
For works with joint authors:
(Thompson and Baily 1990)
For works up to three authors:
(Smith, Jones, and Davis 1962)
For more than three authors use et al.
(Mills et al. 1992)