Lua APA (7ú heag.)

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

Lua i Stíl Chicago (17ú heag.)

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

Lua MLA (8ú heag.)

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

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