APA-viite (7. p.)

Langer, W. L. (1972). An encyclopedia of world history: Ancient, medieval, and modern, chronologically arranged (5th ed., rev. and enlwith maps and genealogical tables.). Houghton Mifflin.

Chicago-viite (17. p.)

Langer, William L. An Encyclopedia of World History: Ancient, Medieval, and Modern, Chronologically Arranged. 5th ed., rev. and enlwith maps and genealogical tables. Boston: Houghton Mifflin, 1972.

MLA-viite (9. p.)

Langer, William L. An Encyclopedia of World History: Ancient, Medieval, and Modern, Chronologically Arranged. 5th ed., rev. and enlwith maps and genealogical tables. Houghton Mifflin, 1972.