Cita APA (7a ed.)

Marcus, R. B. (1993). Modalities: Philosophical essays. Oxford University Press.

Cita Chicago Style (17a ed.)

Marcus, Ruth Barcan. Modalities: Philosophical Essays. New York [etc.]: Oxford University Press, 1993.

Cita MLA (9a ed.)

Marcus, Ruth Barcan. Modalities: Philosophical Essays. Oxford University Press, 1993.