Bernstein, R. A., & Ronald A. Berstein and Associates. (1984). Successful direct selling: How to plan, launch, promote, and maintain a profitable direct-selling company. Prentice-Hall.
Citace podle Chicago (17th ed.)Bernstein, Ronald A., a Ronald A. Berstein and Associates. Successful Direct Selling: How to Plan, Launch, Promote, and Maintain a Profitable Direct-selling Company. Eblgwood Cliffs, N.J: Prentice-Hall, 1984.
Citace podle MLA (9th ed.)Bernstein, Ronald A., a Ronald A. Berstein and Associates. Successful Direct Selling: How to Plan, Launch, Promote, and Maintain a Profitable Direct-selling Company. Prentice-Hall, 1984.
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