APA (7th ed.) Citation

Langer, W. L. (1948). Encyclopedia of world history, ancient, medieval and modern, chronologically arranged (Rev. ed.). Harrap.

Chicago Style (17th ed.) Citation

Langer, William L. Encyclopedia of World History, Ancient, Medieval and Modern, Chronologically Arranged. Rev. ed. Lond.: Harrap, 1948.

MLA (8th ed.) Citation

Langer, William L. Encyclopedia of World History, Ancient, Medieval and Modern, Chronologically Arranged. Rev. ed. Harrap, 1948.