Cita APA

William L Langer. (1968). An encyclopedia of world history. Boston, Massachusetts: Houghton Mifflin.

Chicago Style Citation

William L Langer. An Encyclopedia of World History. Boston, Massachusetts: Houghton Mifflin, 1968.

Cita MLA

William L Langer. An Encyclopedia of World History. Boston, Massachusetts: Houghton Mifflin, 1968.

Atenció: Aquestes cites poden no estar 100% correctes.