Cita APA (7a ed.)

Lefferts, W., Soifer, I., Cutright, P., & Jarolimek, J. (1980). The old world. Macmillan.

Cita Chicago Style (17a ed.)

Lefferts, Walter, Israel Soifer, Prudence Cutright, y John Jarolimek. The Old World. New York: Macmillan, 1980.

Cita MLA (9a ed.)

Lefferts, Walter, et al. The Old World. Macmillan, 1980.