Cita APA (7a ed.)

Cicerón, M. T., Griffin, M. T., & Atkins, E. M. (1991). On duties. Cambridge University Press.

Cita Chicago Style (17a ed.)

Cicerón, Marco Tulio, Miriam T. Griffin, y E. M. Atkins. On Duties. Cambridge [England] ; New York: Cambridge University Press, 1991.

Cita MLA (8a ed.)

Cicerón, Marco Tulio, et al. On Duties. Cambridge University Press, 1991.