Cita APA (7th ed.)

Unamuno y Jugo, M. d., & Gross, S. (1968). Perplexities and paradoxes. Green-Wood Press.

Cita Chicago (17th ed.)

Unamuno y Jugo, Miguel de, i Stuart Gross. Perplexities and Paradoxes. New York: Green-Wood Press, 1968.

Cita MLA (9th ed.)

Unamuno y Jugo, Miguel de, i Stuart Gross. Perplexities and Paradoxes. Green-Wood Press, 1968.