STEVENS ROBERT E. (2002). MARKETING PLANNING GUIDE. JAICO PUBLISHING HOUSE.
Lua i Stíl Chicago (17ú heag.)STEVENS ROBERT E. MARKETING PLANNING GUIDE. MUMBAI: JAICO PUBLISHING HOUSE, 2002.
Lua MLA (9ú heag.)STEVENS ROBERT E. MARKETING PLANNING GUIDE. JAICO PUBLISHING HOUSE, 2002.
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