1. IEA (International Energy Agency). Global EV outlook 2016: beyond one million electric cars. Report, OECD/IEA, Paris, France, 2016. http://www.iea.org/t&c (accessed 2 December 2016).
2. Do electric vehicles need subsidies? Ownership costs for conventional, hybrid, and electric vehicles in 14 U.S. cities
3. IEA. Global EV outlook 2017: two million and counting. Report, OECD/IEA, Paris, France, 2017. http://www.iea.org/t&c (accessed 3 November 2017).
4. IEA. Global EV outlook 2018: towards cross-modal electrification. Report, OECD/IEA, Paris, France, 2018. http://www.iea.org/t&c (accessed 9 June 2018).
5. IEA. Global EV outlook 2019: scaling-up the transition to electric mobility. Report, OECD/IEA, Paris, France, 2019. http://www.iea.org/t&c (accessed 25 June 2019).