1. PV Status Report 2017;Jäger-Waldau,2017
2. REN21, reportRenewables 2017 Global Status Report, Paris, 2017. www.ren21.net/gsr-2017/.
3. World Energy Outlook 2016;International Energy Agency (IEA),2016
4. Renewable Power Generation Costs in 2017;IRENA,2018
5. Trends 2017 in Photovoltaic Applications. Survey Report of Selected IEA Countries between 1992 and 2016;(IEA) International Energy Agency,2018