Leffler, M. (1952). How to become a successful manufacturer's representative. Prentice-Hall.
Citace podle Chicago (17th ed.)Leffler, Marvin. How to Become a Successful Manufacturer's Representative. New York: Prentice-Hall, 1952.
Citace podle MLA (9th ed.)Leffler, Marvin. How to Become a Successful Manufacturer's Representative. Prentice-Hall, 1952.
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