APA
Transportation Research Record 2128, . (2009). Traffic signal systems 2009. Washington DC: Transportation Research Record 2128.
Chicago
Transportation Research Record 2128, . 2009. Traffic signal systems 2009. Washington DC: Transportation Research Record 2128.
Harvard
Transportation Research Record 2128, . (2009). Traffic signal systems 2009. Washington DC: Transportation Research Record 2128.
MLA
Transportation Research Record 2128, . Traffic signal systems 2009. Washington DC: Transportation Research Record 2128. 2009.