- Author: George Beekman, Alex R. Tabora, Rosbina Pacheco
- Language: Spanish
- Year: 2007
- Author: George Beekman
- Language: Spanish
- Year: 2004
- Author: Robert T. Grauer, George Beekman, Maryann Barber, María Elena Zahar Arellano
- Language: Spanish
- Year: 2010
- Author: George Beekman Ben Beekman
- Language: English
- Year: 2013