APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

Vallen, Gary K., and Jerome J. Vallen. Check-in Check-out. 6th ed. Prentice-Hall, 2000.