APA (7th ed.) Citation

Busigny, F., Boesch, J., Gruen, E. S., & Sieber, E. (1968). Historia universal. Losada.

Chicago Style (17th ed.) Citation

Busigny, Felix, Joseph Boesch, Erich S. Gruen, and Eduard Sieber. Historia Universal. Buenos Aires, Argentina: Losada, 1968.

MLA (9th ed.) Citation

Busigny, Felix, et al. Historia Universal. Losada, 1968.