- Author: David S. Loughran, Seth A. Seabury, Laura Zakaras
- Language: English
- Year: 2007
- Author: David Walters
- Language: English
- Year: 2007
- Author: Nicholas Barr
- Language: English
- Year: 2001
- Author: Hana Polackova Brixi, Allen Schick
- Language: English
- Year: 2001
- Author: Gerald T. West, Ethel I. Tarazona, World Bank
- Language: English
- Year: 2001