APA (7th ed.) Citation

Langer, W. L. (2006). Chronological encyclopedia of world history: Ancient, medieval and modern. Cosmo Publications.

Chicago Style (17th ed.) Citation

Langer, William L. Chronological Encyclopedia of World History: Ancient, Medieval and Modern. New Delhi: Cosmo Publications, 2006.

MLA (9th ed.) Citation

Langer, William L. Chronological Encyclopedia of World History: Ancient, Medieval and Modern. Cosmo Publications, 2006.