Petrossian, S. V. (1980). Traffic signals. Main Roads Dept., W.A..
Chicago Style (17. basım) AtıfPetrossian, Sarkis V. Traffic Signals. Perth: Main Roads Dept., W.A., 1980.
MLA (8th ed.) AtıfPetrossian, Sarkis V. Traffic Signals. Main Roads Dept., W.A., 1980.
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