West, W. M., & West, R. (1936). The story of modern progress with a preliminary survey of eariler progress (New ed.). Allyn and Bacon.
Chicago-referens (17:e uppl.)West, Willis Mason, och Ruth West. The Story of Modern Progress with a Preliminary Survey of Eariler Progress. New ed. Boston ; New York [etc.]: Allyn and Bacon, 1936.
MLA-referens (8:e uppl.)West, Willis Mason, och Ruth West. The Story of Modern Progress with a Preliminary Survey of Eariler Progress. New ed. Allyn and Bacon, 1936.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.