Cita APA (7th ed.)

Shaughnessy, J. J., Zechmeister, E. B., & Zechmeister, J. S. (2009). Research methods in psychology (8th, international ed.). McGraw-Hill Higher Education.

Cita Chicago (17th ed.)

Shaughnessy, John J., Eugene B. Zechmeister, i Jeanne S. Zechmeister. Research Methods in Psychology. 8th, international ed. Boston, Mass: McGraw-Hill Higher Education, 2009.

Cita MLA (9th ed.)

Shaughnessy, John J., et al. Research Methods in Psychology. 8th, international ed. McGraw-Hill Higher Education, 2009.