Colvin, G. (2007). 7 steps for developing a proactive schoolwide discipline plan: A guide for principals and leadership teams. Corwin Press.
Chicago-Zitierstil (17. Ausg.)Colvin, Geoffrey. 7 Steps for Developing a Proactive Schoolwide Discipline Plan: A Guide for Principals and Leadership Teams. Thousand Oaks, Calif: Corwin Press, 2007.
MLA-Zitierstil (9. Ausg.)Colvin, Geoffrey. 7 Steps for Developing a Proactive Schoolwide Discipline Plan: A Guide for Principals and Leadership Teams. Corwin Press, 2007.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.