Van Noppen, I. W. (1939). The westward movement: A book of readings on our changing frontiers. D. Appleton-Century Co.
Citace podle Chicago (17th ed.)Van Noppen, Ina Woestemeyer. The Westward Movement: A Book of Readings on Our Changing Frontiers. New York: D. Appleton-Century Co, 1939.
Citace podle MLA (8th ed.)Van Noppen, Ina Woestemeyer. The Westward Movement: A Book of Readings on Our Changing Frontiers. D. Appleton-Century Co, 1939.
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