Cita APA (7th ed.)

Howitt, D., & Cramer, D. Introduction to research methods in psychology (3rd ed.).

Cita Chicago (17th ed.)

Howitt, Dennis, i Duncan Cramer. Introduction to Research Methods in Psychology. 3rd ed.

Cita MLA (8th ed.)

Howitt, Dennis, i Duncan Cramer. Introduction to Research Methods in Psychology. 3rd ed.