Gurr, J. E. (1959). The principle of sufficient reason in some scholastic systems 1750-1900. The Marquette University.
Citace podle Chicago (17th ed.)Gurr, John Edwin. The Principle of Sufficient Reason in Some Scholastic Systems 1750-1900. Milwaukee: The Marquette University, 1959.
Citace podle MLA (9th ed.)Gurr, John Edwin. The Principle of Sufficient Reason in Some Scholastic Systems 1750-1900. The Marquette University, 1959.
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