Cita APA

Koren, H. J., & Koren, H. J. (1960). An Introduction to the philosophy of nature. Pittsburgh: Duquesne University.

Citación estilo Chicago

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

Cita MLA

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