Cita APA (7th ed.)
Lefferts, W., Soifer, I., Cutright, P., & Jarolimek, J. Living in the Old World. Macmillan.
Cita Chicago (17th ed.)
Lefferts, Walter, Israel Soifer, Prudence Cutright, i John Jarolimek. Living in the Old World. Nueva York, EUA: Macmillan.
Cita MLA (9th ed.)
Lefferts, Walter, et al. Living in the Old World. Macmillan.
Atenció: Aquestes cites poden no estar 100% correctes.