Cita APA (7th ed.)

Langsam, W. C. (1954). The world since 1919 (7th ed. of The world since 1914.). Macmillan.

Cita Chicago (17th ed.)

Langsam, Walter Consuelo. The World Since 1919. 7th ed. of The world since 1914. New York: Macmillan, 1954.

Cita MLA (8th ed.)

Langsam, Walter Consuelo. The World Since 1919. 7th ed. of The world since 1914. Macmillan, 1954.