APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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