Dyfyniad APA

Johnston, M. W., & Marshall, G. W. (2008). Relationship selling. Boston: McGraw-Hill/Irwin.

Dyfyniad Arddull Chicago

Johnston, Mark W., and Greg W. Marshall. Relationship Selling. Boston: McGraw-Hill/Irwin, 2008.

Dyfyniad MLA

Johnston, Mark W., and Greg W. Marshall. Relationship Selling. Boston: McGraw-Hill/Irwin, 2008.

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