APA (7th ed.) Citation

Sosa, R., Lindsey, J., & Sosa, R. (1983). The difficult days. Princeton University Press.

Chicago Style (17th ed.) Citation

Sosa, Roberto, Jim Lindsey, and Roberto Sosa. The Difficult Days. Princeton, N.J.: Princeton University Press, 1983.

MLA (9th ed.) Citation

Sosa, Roberto, et al. The Difficult Days. Princeton University Press, 1983.