Cita APA (7th ed.)

Howitt, D., & Cramer, D. (2005). Introduction to research methods in psychology. Pearson/Prentice Hall.

Cita Chicago (17th ed.)

Howitt, Dennis, i Duncan Cramer. Introduction to Research Methods in Psychology. Harlow, England, New York: Pearson/Prentice Hall, 2005.

Cita MLA (9th ed.)

Howitt, Dennis, i Duncan Cramer. Introduction to Research Methods in Psychology. Pearson/Prentice Hall, 2005.