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Dyfyniad Arddull ChicagoBrown, MIlton P...[et al.], England wilbur B, and Mathews John B. Problems in Marketing/3e. 3rd ed. New York: McGraw Hill, 1961.
Dyfyniad MLABrown, MIlton P...[et al.], et al. Problems in Marketing/3e. 3rd ed. McGraw Hill, 1961.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.