Sheldon, A. F. (1911). The art of selling, for business colleges, high schools of commerce, Y.M.C.A classes and private students. The Sheldon university press.
Citace podle Chicago (17th ed.)Sheldon, Arthur Frederick. The Art of Selling, for Business Colleges, High Schools of Commerce, Y.M.C.A Classes and Private Students. Libertyville, Ill: The Sheldon university press, 1911.
Citace podle MLA (9th ed.)Sheldon, Arthur Frederick. The Art of Selling, for Business Colleges, High Schools of Commerce, Y.M.C.A Classes and Private Students. The Sheldon university press, 1911.
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