APA (7th ed.) Citation

Langer, W. L., & Bruun, G. (1948). An encyclopedia of world history, ancient, medieval and modern, chronologically arranged (Revised edition.). Houghton Mifflin Co..

Chicago Style (17th ed.) Citation

Langer, William L., and Geoffrey Bruun. An Encyclopedia of World History, Ancient, Medieval and Modern, Chronologically Arranged. Revised edition. Boston: Houghton Mifflin Co., 1948.

MLA (9th ed.) Citation

Langer, William L., and Geoffrey Bruun. An Encyclopedia of World History, Ancient, Medieval and Modern, Chronologically Arranged. Revised edition. Houghton Mifflin Co., 1948.