- Author: Learning Express
- Language: English
- Year: 2003
- Author: LearningExpress
- Language: English
- Year: 2013
- Author: Learningexpress
- Language: English
- Year: 2015
- Author: LearningExpress LLC
- Language: English
- Year: 2014
- Author: LearningExpress, McKibben Mark A
- Language: English
- Year: 2012
- Author: Michael B McGinnis
- Language: English
- Year: 2005