APA

Shaughnessy J. J. [. a., . (2003). Research methods in psychology. Boston: McGraw Hill.

Chicago

Shaughnessy John J [et al.], . 2003. Research methods in psychology. Boston: McGraw Hill.

Harvard

Shaughnessy J. J. [. a., . (2003). Research methods in psychology. Boston: McGraw Hill.

MLA

Shaughnessy John J [et al.], . Research methods in psychology. Boston: McGraw Hill. 2003.