Huffman, H. (1975). Programmed business mathematics (3rd ed.). Gregg and Community College Division/ McGraw-Hill.
Citace podle Chicago (17th ed.)Huffman, Harry. Programmed Business Mathematics. 3rd ed. New York: Gregg and Community College Division/ McGraw-Hill, 1975.
Citace podle MLA (8th ed.)Huffman, Harry. Programmed Business Mathematics. 3rd ed. Gregg and Community College Division/ McGraw-Hill, 1975.
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