(1940). Regulation and operation of emergency vehicles. Bureau of Municipal Research and Service, University of Oregon, cooperating with the League of Oregon Cities.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Regulation and Operation of Emergency Vehicles. Eugene: Bureau of Municipal Research and Service, University of Oregon, cooperating with the League of Oregon Cities, 1940.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Regulation and Operation of Emergency Vehicles. Bureau of Municipal Research and Service, University of Oregon, cooperating with the League of Oregon Cities, 1940.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.