Citazione APA

Close, U., & Burke, M. (1945). The ladder of history. The Macmillan Co..

Stile di citazione Chicago

Close, Upton, e Merle Burke. The Ladder of History. New York: The Macmillan Co., 1945.

Citazione MLA

Close, Upton, e Merle Burke. The Ladder of History. The Macmillan Co., 1945.