APA (7th ed.) Citation

Vallen, G. K., & Vallen, J. J. (2013). Check-in check-out (Ninth edition.). Pearson.

Chicago Style (17th ed.) Citation

Vallen, Gary K., and Jerome J. Vallen. Check-in Check-out. Ninth edition. Boston: Pearson, 2013.

MLA (9th ed.) Citation

Vallen, Gary K., and Jerome J. Vallen. Check-in Check-out. Ninth edition. Pearson, 2013.