APA (7th ed.) Citation

Langer, W. L. (1972). An encyclopedia of world history: Ancient, medieval, and modern, chronologically arranged (Fifth edition, revised and enlarged.). Houghton Mifflin.

Chicago Style (17th ed.) Citation

Langer, William L. An Encyclopedia of World History: Ancient, Medieval, and Modern, Chronologically Arranged. Fifth edition, revised and enlarged. Boston: Houghton Mifflin, 1972.

MLA (9th ed.) Citation

Langer, William L. An Encyclopedia of World History: Ancient, Medieval, and Modern, Chronologically Arranged. Fifth edition, revised and enlarged. Houghton Mifflin, 1972.