- Author: Richard C. Levin
- Language: English
- Year: 2008
- Author: Richard C. Levin
- Language: English
- Year: 2013
- Author: Richard I. Levin, David S. Rubin
- Language: Spanish
- Year: 2004
- Author: Richard I. Levin
- Language: English
- Year: 2018
- Author: Richard I. Levin David S. Rubin
- Language: Spanish
- Year: 2004
- Author: Richard C. Levin
- Language: English
- Year: 2003