Callingham, M. (2004). Market intelligence: How and why organizations use market research. Kogan Page.
Lua i Stíl Chicago (17ú heag.)Callingham, Martin. Market Intelligence: How and Why Organizations Use Market Research. London ; Sterling, Va.: Kogan Page, 2004.
Lua MLA (9ú heag.)Callingham, Martin. Market Intelligence: How and Why Organizations Use Market Research. Kogan Page, 2004.
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