Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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