Callingham, M. (2004). Market intelligence: How and why organizations use market research. Kogan Page.
Cita Chicago (17th ed.)Callingham, Martin. Market Intelligence: How and Why Organizations Use Market Research. London ; Sterling, Va.: Kogan Page, 2004.
Cita MLA (9th ed.)Callingham, Martin. Market Intelligence: How and Why Organizations Use Market Research. Kogan Page, 2004.
Atenció: Aquestes cites poden no estar 100% correctes.