Randall, Geoffrey
Principles of marketing
Routledge, 1993
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Kotler, Philip
Principles of marketing
Prentice-Hall, 2001
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Tousley, Rayburn D.
Principles of marketing
Macmillan, 1962
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Kotler, Philip
Principles of marketing
Prentice Hall International, 1983
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Clark, Fred E.
Principles of marketing
Macmillan, 1947
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