Citazione APA

Langsam, W. C., & Mitchell, O. C. (1971). World since [1919] (8th ed.). Macmillan.

Stile di citazione Chicago

Langsam, Walter Consuelo, e Otis C. Mitchell. World Since [1919]. 8th ed. New York: Macmillan, 1971.

Citazione MLA

Langsam, Walter Consuelo, e Otis C. Mitchell. World Since [1919]. 8th ed. Macmillan, 1971.