Cita APA (7a ed.)

Ley, P. (1972). Quantitative aspects of psychological assessment: An introduction. Duckworth.

Cita Chicago Style (17a ed.)

Ley, Philip. Quantitative Aspects of Psychological Assessment: An Introduction. London: Duckworth, 1972.

Cita MLA (9a ed.)

Ley, Philip. Quantitative Aspects of Psychological Assessment: An Introduction. Duckworth, 1972.