Cita APA (7a ed.)

Beard, C. A., Beard, M. R., & Beard, W. New Basic History of the United States.

Cita Chicago Style (17a ed.)

Beard, Charles A., Mary R. Beard, y William Beard. New Basic History of the United States.

Cita MLA (9a ed.)

Beard, Charles A., et al. New Basic History of the United States.