Cita APA (7a ed.)

Gurr, J. E. (1959). The principle of sufficient reason in some scholastic systems, 1750-1900. Marquette University Press.

Cita Chicago Style (17a ed.)

Gurr, John Edwin. The Principle of Sufficient Reason in Some Scholastic Systems, 1750-1900. Milwaukee: Marquette University Press, 1959.

Cita MLA (9a ed.)

Gurr, John Edwin. The Principle of Sufficient Reason in Some Scholastic Systems, 1750-1900. Marquette University Press, 1959.