- [Fuel Economy and Environment](https://www.fueleconomy.gov/feg/hybrid_fe_tech.shtml)
- [Hybrid Electric Vehicle Technology](https://www.energy.gov/eere/vehicles/articles/hybrid-electric-vehicle-technology)
2. U.S. Environmental Protection Agency (EPA):
- [Guide för bränsleekonomi för hybrid- och elbilar](https://www.fueleconomy.gov/feg/hybrid_electric_car_guide.shtml)
- [Grön fordonsguide](https://www.epa.gov/greenvehicles/)
3. California Air Resources Board (CARB):
- [Hybridelektriska fordon](https://ww2.arb.ca.gov/our-work/programs/hybrid-and-zero-emission-vehicle-program)
4. International Council on Clean Transportation (ICCT):
- [Hybridfordon och utsläpp](https://theicct.org/publications/hybrid-vehicles-emissions)
5. HybridCars.com:
- [Fuel Efficiency and Emissions](https://www.hybridcars.com/fuel-efficiency/)
6. Plug-in Amerika:
- [Hybrid Electric Vehicles (HEVs) vs. Plug-In Electric Vehicles (PEVs)](https://www.pluginamerica.org/learning-center/alternative-vehicles/hybrid-electric-vs-plug-in-electric- fordon/)
7. Green Car Reports:
- [Hybridbilsutsläpp jämfört med konventionella bensinfordon](https://www.greencarreports.com/news/1104326_hybrid-car-emissions-compared-to-conventional-benzine-vehicles)
8. Biltillverkares webbplatser:
– De flesta biltillverkare ger detaljerad information om bränsleeffektiviteten och utsläppen för sina hybridbilsmodeller.
