Dyfyniad APA

Aaker, D. A., & Day, G. (1990). Marketing research/4e (4th ed.). John Wiley.

Dyfyniad Arddull Chicago

Aaker, David. A., and George.S Day. Marketing Research/4e. 4th ed. John Wiley, 1990.

Dyfyniad MLA

Aaker, David. A., and George.S Day. Marketing Research/4e. 4th ed. John Wiley, 1990.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.