(1977). Manual of traffic controls: Warning signs, lights, and devices for use in performance of work upon highways. California: State of California.
Παραπομπή Chicago StyleManual of Traffic Controls: Warning Signs, Lights, and Devices for Use in Performance of Work Upon Highways. California: State of California, 1977.
Παραπομπή MLAManual of Traffic Controls: Warning Signs, Lights, and Devices for Use in Performance of Work Upon Highways. California: State of California, 1977.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.