1. 1. The World, B. 2017. "The World Population, Total | Data" [Online]. https://data.worldbank.org/indicator/sp.pop.totl, Son erişim tarihi: 22th Augost 2019.
2. 2. Capuano, L. 2018. "International energy outlook 2018 (IEO2018)".
3. 3. Ren21. 2019. "Renewables 2019 Global Status Report".
4. 4. Nghiem, L. D., Koch, K., Bolzonella, D. ve Drewes, J. E. 2017. "Full scale co-digestion of wastewater sludge and food waste: Bottlenecks and possibilities". Renewable and Sustainable Energy Reviews, 72, 354-362.
5. 5. Sawin, J. L., Rutovitz, J. ve Sverrisson, F. 2019. "Renewables 2018 Global Status Report".