APA

Shaughnessy, Zechmeister E. & Zechmeister J. (2003). Research methods in psychology. Boston: McGraw-Hill.

Chicago

Shaughnessy, Zechmeister E.B and Zechmeister J.S. 2003. Research methods in psychology. Boston: McGraw-Hill.

Harvard

Shaughnessy, Zechmeister E. and Zechmeister J. (2003). Research methods in psychology. Boston: McGraw-Hill.

MLA

Shaughnessy, Zechmeister E.B and Zechmeister J.S. Research methods in psychology. Boston: McGraw-Hill. 2003.