Guidelines for the maintenance of traffic signal systems /
prepared by Edwards and Kelcey, Inc.

APA Citation

Edwards and Kelcey, i., Pennsylvania. Department of Transportation. (1983). Guidelines for the maintenance of traffic signal systems. [Harrisburg, Pa.]: Pennsylvania Dept. of Transportation.

MLA Citation

Edwards and Kelcey, inc, and Pennsylvania. Department of Transportation. Guidelines for the Maintenance of Traffic Signal Systems. [Harrisburg, Pa.]: Pennsylvania Dept. of Transportation, 1983.