APA

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

Chicago

Gurr John Edwin, . 1959. The principle of sufficient reason in some scholastic systems, 1750-1900. : Marquette University Press.

Harvard

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

MLA

Gurr John Edwin, . The principle of sufficient reason in some scholastic systems, 1750-1900. : Marquette University Press. 1959.