Cita APA (7a ed.)

Unamuno, M. d., Kerrigan, A., & Nozick, M. (1977). The tragic sense of life in men and nations. Princeton University Press.

Cita Chicago Style (17a ed.)

Unamuno, Miguel de, Anthony Kerrigan, y Martin Nozick. The Tragic Sense of Life in Men and Nations. [Princeton, N.J.]: Princeton University Press, 1977.

Cita MLA (8a ed.)

Unamuno, Miguel de, et al. The Tragic Sense of Life in Men and Nations. Princeton University Press, 1977.