Hamper, Robert J.,
Strategic market planning/ Robert J.Hamper
NTC Bussiness Book, 1992
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Cespedes, Frank V.
Concurrent marketing: integrating product, sales, and service/Frank V. Cespedes
Harvard Business School Press, 1995
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Sonny Koeswara
Pemasaran Industri (industrial marketing) / Sonny Koeswara
Djambatan, 1995
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Bradley, Frank
Strategic Marketing
John Wiley & Sons, Ltd, 2003
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Battersby, Albert
Sales forecasting
Penguin Books, 1968
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