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Walker, Orville C., John W. Mullins, Felix Mavondo, John Gountas, Anton Kriz, and Carol Osborne. Marketing Strategy: A Decision-focused Approach. 3e. North Ryde, NSW: McGraw-Hill Education (Australia), 2015.

Walker, Orville C., et al. Marketing Strategy: A Decision-focused Approach. 3e. McGraw-Hill Education (Australia), 2015.