Dyfyniad APA
Ries, A., & Trout, J. (1989). Bottom-up marketing. McGraw-Hill.
Dyfyniad Arddull Chicago
Ries, Al, and Jack Trout. Bottom-up Marketing. New York: McGraw-Hill, 1989.
Dyfyniad MLA
Ries, Al, and Jack Trout. Bottom-up Marketing. McGraw-Hill, 1989.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.