Wallace,J P, & Sherret,A. (1973). Estimation of product attributes and their importances. Springer - Verlag.
Dyfyniad Arddull ChicagoWallace,J P, and Sherret,A. Estimation of Product Attributes and Their Importances. Berlin: Springer - Verlag, 1973.
Dyfyniad MLAWallace,J P, and Sherret,A. Estimation of Product Attributes and Their Importances. Springer - Verlag, 1973.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.