Traffic signal warrants a bibliography.
| Údar corparáideach: | |
|---|---|
| Formáid: | LEABHAR |
| Teanga: | English |
| Foilsithe / Cruthaithe: |
Washington, D.C.
Transportation Research Board, National Research Council
[1975]
|
| Sraith: | National Cooperative Highway Research Program
no. 78. |