Vallen, G. K., & Vallen, J. J. (2000). Check-in check-out (6th ed.). Upper Saddle River, NJ: Prentice Hall.
Trích dẫn kiểu ChicagoVallen, Gary K., và Jerome J. Vallen. Check-in Check-out. 6th ed. Upper Saddle River, NJ: Prentice Hall, 2000.
MLA引文Vallen, Gary K., và Jerome J. Vallen. Check-in Check-out. 6th ed. Upper Saddle River, NJ: Prentice Hall, 2000.
警告：這些引文格式不一定是100％准確.