Cita APA (7a ed.)

Palmer, R. R., & Colton, J. G. (1971). A history of the modern world (4th ed.). Knopf.

Cita Chicago Style (17a ed.)

Palmer, R. R., y Joel G. Colton. A History of the Modern World. 4th ed. New York: Knopf, 1971.

Cita MLA (9a ed.)

Palmer, R. R., y Joel G. Colton. A History of the Modern World. 4th ed. Knopf, 1971.