BELL, M. L. (1966). Marketing concepts and strategy. Macmillan.
Cita Chicago (17th ed.)BELL, Martin L. Marketing Concepts and Strategy. London: Macmillan, 1966.
Cita MLA (9th ed.)BELL, Martin L. Marketing Concepts and Strategy. Macmillan, 1966.
Atenció: Aquestes cites poden no estar 100% correctes.