Dyfyniad APA

West, W. M. (1927). The story of world progress. Allyn and Bacon.

Dyfyniad Arddull Chicago

West, Willis M. The Story of World Progress. Boston ; New York [etc.]: Allyn and Bacon, 1927.

Dyfyniad MLA

West, Willis M. The Story of World Progress. Allyn and Bacon, 1927.

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