Aaker, D. A. (2004). Marketing researchDavid A. Aaker, V. Kumar, George S. Day. John Wiley & Sons.
Lua i Stíl Chicago (17ú heag.)Aaker, David A. Marketing ResearchDavid A. Aaker, V. Kumar, George S. Day. John Wiley & Sons, 2004.
Lua MLA (8ú heag.)Aaker, David A. Marketing ResearchDavid A. Aaker, V. Kumar, George S. Day. John Wiley & Sons, 2004.
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