Cita APA (7a ed.)

Unamuno, M. d., & Gross, S. (1968). Perplexities and paradoxes. Greenwood Press.

Cita Chicago Style (17a ed.)

Unamuno, Miguel de, y Stuart Gross. Perplexities and Paradoxes. New York: Greenwood Press, 1968.

Cita MLA (9a ed.)

Unamuno, Miguel de, y Stuart Gross. Perplexities and Paradoxes. Greenwood Press, 1968.