Langer, W. L. 1. (1972). An encyclopedia of world history: Ancient, medieval, and modern, chronologically arranged (5th ed., rev. and enl.). Boston: Houghton Mifflin.
Чикагска система за цитиранеLanger, William L. 1896-1977. An Encyclopedia of World History: Ancient, Medieval, and Modern, Chronologically Arranged. 5th ed., rev. and enl. Boston: Houghton Mifflin, 1972.
MLA формат за цитиранеLanger, William L. 1896-1977. An Encyclopedia of World History: Ancient, Medieval, and Modern, Chronologically Arranged. 5th ed., rev. and enl. Boston: Houghton Mifflin, 1972.
Внимание: Тези цитати може да не са 100% точни.