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Lua i Stíl Chicago (17ú heag.)Pederson, Carlton A ... et. al. Selling Principles And Methods Carlton A Pederson, Milburn D. Wright And Barton A. Weitz. Irwin, 1988.
Lua MLA (8ú heag.)Pederson, Carlton A ... et. al. Selling Principles And Methods Carlton A Pederson, Milburn D. Wright And Barton A. Weitz. Irwin, 1988.
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