1. Institute for Development of Economics and Finance, Jakarta, Indonesia
2. Indonesian Ministry of Environment and Forestry, Jakarta, Indonesia
3. E Co. Ltd Group, London, UK
4. Department of Economics, Universitas Padjadjaran, Sumedang, Indonesia
5. Bank Rakyat Indonesia Research Institute, Jakarta, Indonesia
6. Department of Economics, University of Indonesia, Depok, Indonesia
7. Centre for Islamic Economics and Business, University of Indonesia, Depok, Indonesia