Pride, W. M. (1991). Marketing concepts and strategies: Study guide (7th ed.). Houghton.
Lua i Stíl Chicago (17ú heag.)Pride, William M. Marketing Concepts and Strategies: Study Guide. 7th ed. Boston: Houghton, 1991.
Lua MLA (9ú heag.)Pride, William M. Marketing Concepts and Strategies: Study Guide. 7th ed. Houghton, 1991.
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