1. Huang, C.M., Chen, Y.S.: Telematics Communication Technologies and Vehicular Networks: Wireless Architectures and Applications. Information Science Reference, IGI Global, Hershey (2010)
2. World Vehicle Population Tops 1 Billion Units.
http://wardsauto.com/ar/world_vehicle_population_110815
3. Violence and Injury Prevention: Country Profiles. Ethiopia.
http://www.who.int/violence_injury_prevention/road_safety_status/country_profiles/en/
4. Global Status Report on Road Safety 2013: Supporting a Decade of Action. World Health Organization, Geneva, Switzerland (2013)
5. Number of Cars Worldwide Surpasses 1 Billion; Can the World Handle this Many Wheels?
http://www.huffingtonpost.ca/2011/0823/car-population_n_934291.html