- Author: C. Henry Edwards David E. Penney
- Language: English
- Year: 2002
- Author: C Henry Edwards, David E. Penney
- Language: Spanish
- Year: 2008
- Author: C. Henry Edwards David E. Penney
- Language: Spanish
- Year: 2013
- Author: Charles Henry Edwards, David E. Penney
- Language: English
- Year: 2007
- Author: C. Henry Edwards David E. Penney
- Language: English
- Year: 1998
- Author: C. Henry Edwards David E. Penney David Calvis
- Language: English
- Year: 2017
- Author: C. Henry Edwards David E. Penney David T. Calvis
- Language: English
- Year: 2015
- Author: C.H. Edwards David E. Penney
- Language: Spanish
- Author: C. Henry Edwards David E. Penney
- Language: English
- Year: 2013
- Author: C. Henry Edwards David E. Penney David T. Calvis
- Language: English
- Year: 2014