Forsylth, P. (2002). Encyclopaedia of management Vol. 6: Sales management. Jaico Publishing Horse.
Lua i Stíl Chicago (17ú heag.)Forsylth, Petrick. Encyclopaedia of Management Vol. 6: Sales Management. Mumbai: Jaico Publishing Horse, 2002.
Lua MLA (8ú heag.)Forsylth, Petrick. Encyclopaedia of Management Vol. 6: Sales Management. Jaico Publishing Horse, 2002.
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