Cita APA (7a ed.)

Agustín, S., & Pontifex, M. (1955). The problem of free choice. Newman.

Cita Chicago Style (17a ed.)

Agustín, Santo, y Mark Pontifex. The Problem of Free Choice. New York ; Ramsey: Newman, 1955.

Cita MLA (9a ed.)

Agustín, Santo, y Mark Pontifex. The Problem of Free Choice. Newman, 1955.