Walker, O. C., Boyd, H. W., & Larreche, J. (1999). Marketing strategy: Planning and implementation (3rd ed.). Irwin McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Walker, Orville C., Harper W. Boyd, agus Jean-Claude Larreche. Marketing Strategy: Planning and Implementation. 3rd ed. Boston: Irwin McGraw-Hill, 1999.
Lua MLA (9ú heag.)Walker, Orville C., et al. Marketing Strategy: Planning and Implementation. 3rd ed. Irwin McGraw-Hill, 1999.
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