Leibowitz, Herschel W.; Owens, D. Alfred; Tyrrell, Richard A.. (1998). «The assured clear distance ahead rule: implications for nighttime traffic safety and the law» Accident Analysis & Prevention 30 (1): 93–99. doi:10.1016/S0001-4575(97)00067-5. PMID9542549..
Leibowitz, Herschel W.; Owens, D. Alfred; Tyrrell, Richard A.. (1998). «The assured clear distance ahead rule: implications for nighttime traffic safety and the law» Accident Analysis & Prevention 30 (1): 93–99. doi:10.1016/S0001-4575(97)00067-5. PMID9542549..