- Author: BJ Schipper
- Language: English
- Year: 2004
- Author: Robert J. Marzano
- Language: English
- Year: 2011
- Author: Earl E. McDowell
- Language: English
- Year: 1991
- Author: V. Oswal, M Remacle, S Jovanvic, J Krespi
- Language: English
- Year: 2002
- Author: A.O. Ibhadon
- Language: English
- Year: 2009
- Author: Lisa Tyler
- Language: English
- Year: 2001