Dyfyniad APA

Zeithaml Valari. (2013). Services Marketing (6th.). McGraw Hill.

Dyfyniad Arddull Chicago

Zeithaml Valari. Services Marketing. 6th. New Delhi: McGraw Hill, 2013.

Dyfyniad MLA

Zeithaml Valari. Services Marketing. 6th. McGraw Hill, 2013.

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