Dyfyniad APA
Harris, E. K. (2007). Customer service: A practical approach (4th ed.). Prentice-Hall.
Dyfyniad Arddull Chicago
Harris, Elaine K. Customer Service: A Practical Approach. 4th ed. New Jersey: Prentice-Hall, 2007.
Dyfyniad MLA
Harris, Elaine K. Customer Service: A Practical Approach. 4th ed. Prentice-Hall, 2007.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.