Lua APA (7ú heag.)

Walker, O. C. (2009). Marketing Strategy (5th.). Tata McGraw Hill Education Private Limited.

Lua i Stíl Chicago (17ú heag.)

Walker, Orville C. Marketing Strategy. 5th. New Delhi: Tata McGraw Hill Education Private Limited, 2009.

Lua MLA (9ú heag.)

Walker, Orville C. Marketing Strategy. 5th. Tata McGraw Hill Education Private Limited, 2009.

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