Cita APA (7a ed.)

Jaspers, K., & Grabau, R. F. (1971). Philosophy of existence. University of Pennsylvania Press.

Cita Chicago Style (17a ed.)

Jaspers, Karl, y Richard F. Grabau. Philosophy of Existence. Philadelphia: University of Pennsylvania Press, 1971.

Cita MLA (9a ed.)

Jaspers, Karl, y Richard F. Grabau. Philosophy of Existence. University of Pennsylvania Press, 1971.