Phillips, C. F. 1., & Duncan, D. J. (1960). Marketing principles and methods. Irwin.
Lua i Stíl Chicago (17ú heag.)Phillips, Charles Franklin 1910, agus Delbert J. Duncan. Marketing Principles and Methods. Homewoood, Ill: Irwin, 1960.
Lua MLA (9ú heag.)Phillips, Charles Franklin 1910, agus Delbert J. Duncan. Marketing Principles and Methods. Irwin, 1960.
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