Walker, O. C. &. O. (2011). Marketing Strategy: A decision -focused approach (5.). Tata McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Walker, Orville C & Others. Marketing Strategy: A Decision -focused Approach. 5. New Delhi: Tata McGraw-Hill, 2011.
Lua MLA (9ú heag.)Walker, Orville C & Others. Marketing Strategy: A Decision -focused Approach. 5. Tata McGraw-Hill, 2011.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.