Ryan, William T
Principles of marketing/ by William Ryan
Richard D. Irwin, 1980
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Ryan, William T.
Personel learning aid for principles of marketing / William T. Ryan; Roger H. hermanson
Dew Jones Irwin, 1980
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Ryan, William T.
Programmed learning ald for principles of marketing / William T. Ryan, Roger H. Hermanson
Learning System Company, 1971
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Davis, Judy
A Guide to web marketing
Crest, 2001
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Cox, William E. Jr.
Industrial marketing research/ William E. Cox, Jr
N.Y. John Wiley c., 1979
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