FERRELL O C. (1993). TEST BANK MARKETING CONCEPTS & STRATERGIES (8TH.). HOUGHTON & MIFFLIN.
Lua i Stíl Chicago (17ú heag.)FERRELL O C. TEST BANK MARKETING CONCEPTS & STRATERGIES. 8TH. BOSTON: HOUGHTON & MIFFLIN, 1993.
Lua MLA (9ú heag.)FERRELL O C. TEST BANK MARKETING CONCEPTS & STRATERGIES. 8TH. HOUGHTON & MIFFLIN, 1993.
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