Walker, O. C. (1995). Marketing strategy: Planning and implementation. Chicago: Irwin.
Trích dẫn kiểu ChicagoWalker, Orville C. Marketing Strategy: Planning and Implementation. Chicago: Irwin, 1995.
MLA citiranjeWalker, Orville C. Marketing Strategy: Planning and Implementation. Chicago: Irwin, 1995.
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