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.