Cita APA

Heffelfinger, C. H., & Weaver, R. B. (1939). Directed studies in world history. Mentzer, Bush & Co..

Citación estilo Chicago

Heffelfinger, C. H., and Robert B. Weaver. Directed Studies in World History. New York ; Chicago: Mentzer, Bush & Co., 1939.

Cita MLA

Heffelfinger, C. H., and Robert B. Weaver. Directed Studies in World History. Mentzer, Bush & Co., 1939.

Warning: These citations may not always be 100% accurate.