APA (7th ed.) Citation

Langer, W. L. (1968). An Encyclopedia of world history: Ancient, medieval, and modern chronologically arranged (4th ed., Rev. and enl. with maps and genealogical tables.). G. G. Harrap.

Chicago Style (17th ed.) Citation

Langer, William Leonard. An Encyclopedia of World History: Ancient, Medieval, and Modern Chronologically Arranged. 4th ed., Rev. and enl. with maps and genealogical tables. London: G. G. Harrap, 1968.

MLA (9th ed.) Citation

Langer, William Leonard. An Encyclopedia of World History: Ancient, Medieval, and Modern Chronologically Arranged. 4th ed., Rev. and enl. with maps and genealogical tables. G. G. Harrap, 1968.