1. Renewable power generation costs in 2017;IRENA,2018
2. Global Status report renewables 2018. Renewable energy policy network for the 21st century;REN21,2018
3. Feed-in tariffs : accelerating the deployment of renewable energy;Mendonça,2009
4. Global wind report- annual market update 2017;GWEC,2018
5. Trends in renewable energy data;IRENA,2018