Dyfyniad APA

Vallen, G. K., & Vallen, J. J. (2000). Check-in check-out (6th ed.). Upper Saddle River, NJ: Prentice Hall.

Dyfyniad Arddull Chicago

Vallen, Gary K., và Jerome J. Vallen. Check-in Check-out. 6th ed. Upper Saddle River, NJ: Prentice Hall, 2000.

Dyfyniad MLA

Vallen, Gary K., và Jerome J. Vallen. Check-in Check-out. 6th ed. Upper Saddle River, NJ: Prentice Hall, 2000.

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