Cita APA (7a ed.)

Unamuno, M. d., & Gross, S. (1945). Perplexities and paradoxes. Philosophical library.

Cita Chicago Style (17a ed.)

Unamuno, Miguel de, y Stuart Gross. Perplexities and Paradoxes. New York: Philosophical library, 1945.

Cita MLA (9a ed.)

Unamuno, Miguel de, y Stuart Gross. Perplexities and Paradoxes. Philosophical library, 1945.