Walker, O. C. (2006). Marketing strategy (5th ed.). Tata McGraw Hill.
Chicago Style aipamenaWalker, Orville C. Marketing Strategy. 5th ed. New Delhi: Tata McGraw Hill, 2006.
MLA aipamenaWalker, Orville C. Marketing Strategy. 5th ed. Tata McGraw Hill, 2006.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.