- Author: World World Bank
- Language: English
- Year: 2020
- Author: World World Bank
- Language: English
- Year: 2018
- Author: Ariel Fiszbein, Ariel Fiszbein, Francisco H. G Ferreira
- Language: English
- Year: 2009
- Author: Ghazala Mansuri Vijayendra Rao
- Language: English
- Year: 2012