APA-viite (7. p.)

Langer, W. L. (1952). An encyclopedia of world history: Ancient, medieval, and modern, chronologically arranged (Revised edition.). Houghton Mifflin.

Chicago-viite (17. p.)

Langer, William L. An Encyclopedia of World History: Ancient, Medieval, and Modern, Chronologically Arranged. Revised edition. Boston: Houghton Mifflin, 1952.

MLA-viite (8. p.)

Langer, William L. An Encyclopedia of World History: Ancient, Medieval, and Modern, Chronologically Arranged. Revised edition. Houghton Mifflin, 1952.