- Author: Robert Kaplan Ellen Kaplan
- Language: English
- Year: 2003
- Author: Robert Kaplan Ellen Kaplan
- Language: English
- Year: 2011
- Author: Robert Kaplan Ellen Kaplan
- Language: English
- Year: 2000
- Author: Robert Kaplan Ellen Kaplan
- Language: English
- Year: 2003
- Author: Robert Kaplan Richard B. Baldauf Jr. (Editors)
- Language: English
- Year: 1999
- Author: Robert Kaplan Ellen Kaplan
- Language: English
- Year: 2011
- Author: Robert Kaplan Richard Baldauf Jr. (Editors)
- Language: English
- Year: 2008
- Author: Robert Kaplan
- Language: English
- Year: 1999
- Author: Robert Kaplan Ellen Kaplan
- Language: English
- Year: 2007