Tonne, H. A. 1. (1939). Business education ; basic principles and trends. The Gregg publishing company.
Lua i Stíl Chicago (17ú heag.)Tonne, Herbert Arthur 1902. Business Education ; Basic Principles and Trends. New York, Chicago [etc.]: The Gregg publishing company, 1939.
Lua MLA (9ú heag.)Tonne, Herbert Arthur 1902. Business Education ; Basic Principles and Trends. The Gregg publishing company, 1939.
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