1. The World’s Cities in 2016: Data Booklet,2016
2. Sustainable urban development (an innovative approach in the development of cities around the world);Khazaei;Int. Res. J. Appl. Basic Sci.,2013
3. The Weight of Cities Resource Requirements of Future Urbanization
https://europa.eu/capacity4dev/unep/documents/weight-cities-resource-requirements-future-urbanization
4. World Cities Report 2016, Urbanization and Development: Emerging Futures, Key Findings and Messages,2016
5. DESA 2018
https://www.un.org/development/desa/publications/2018-revision-of-world-urbanization-prospects.html