APA (7th ed.) Citation

Vallen, G. K., & Vallen, J. J. (1996). Check-in check-out (5th ed.). Irwin.

Chicago Style (17th ed.) Citation

Vallen, Gary K., and Jerome J. Vallen. Check-in Check-out. 5th ed. Chicago, Ill: Irwin, 1996.

MLA (9th ed.) Citation

Vallen, Gary K., and Jerome J. Vallen. Check-in Check-out. 5th ed. Irwin, 1996.