- Author: Richard K. Betts
- Language: English
- Year: 2022
- Author: Leslie H. Gelb, Richard K. Betts
- Language: English
- Year: 2016
- Author: Richard K. Betts
- Language: English
- Year: 2017
- Author: Richard K. Betts
- Language: English
- Year: 2012
- Author: Richard K. Betts
- Language: English
- Year: 2017
- Author: Richard K. Betts
- Language: English
- Year: 2017
- Author: Richard K. Betts
- Language: English
- Year: 2012
- Author: Richard K. Betts
- Language: English
- Year: 2012
- Author: Richard K. Betts
- Language: English
- Year: 2011
- Author: Leslie H. Gelb Richard K. Betts
- Language: English
- Year: 2000