APA

Shaughnessy J. J., Zechmeister E. B. & Grebb J. A. (1997). Research methods in Psychology. : McGraw-Hill.

Chicago

Shaughnessy John J, Zechmeister Eugene B and Grebb Jack A. 1997. Research methods in Psychology. : McGraw-Hill.

Harvard

Shaughnessy J. J., Zechmeister E. B. and Grebb J. A. (1997). Research methods in Psychology. : McGraw-Hill.

MLA

Shaughnessy John J, Zechmeister Eugene B and Grebb Jack A. Research methods in Psychology. : McGraw-Hill. 1997.