APA

U.S. Department of Transportation, . (1975). Traffic control devices handbook. An operating guide. Washington DC: National Advisory Committee on Uniform Traffic Control Devices.

Chicago

U.S. Department of Transportation, . 1975. Traffic control devices handbook. An operating guide. Washington DC: National Advisory Committee on Uniform Traffic Control Devices.

Harvard

U.S. Department of Transportation, . (1975). Traffic control devices handbook. An operating guide. Washington DC: National Advisory Committee on Uniform Traffic Control Devices.

MLA

U.S. Department of Transportation, . Traffic control devices handbook. An operating guide. Washington DC: National Advisory Committee on Uniform Traffic Control Devices. 1975.