Dyfyniad APA

Webber, R. T., & Johnson, R. H. (1993). Buying and supplying quality. Tata McGraw Hill.

Dyfyniad Arddull Chicago

Webber, Richard T., and Ross H. Johnson. Buying and Supplying Quality. New Delhi: Tata McGraw Hill, 1993.

Dyfyniad MLA

Webber, Richard T., and Ross H. Johnson. Buying and Supplying Quality. Tata McGraw Hill, 1993.

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