Cita APA (7a ed.)

Koren, H. J. (1960). An introduction to the philosophy of nature. Duquesne University.

Cita Chicago Style (17a ed.)

Koren, Henry J. An Introduction to the Philosophy of Nature. Pittsburgh: Duquesne University, 1960.

Cita MLA (9a ed.)

Koren, Henry J. An Introduction to the Philosophy of Nature. Duquesne University, 1960.