(1941). Bicycle control in metropolitan cities. Portland Branch, Bureau of Municipal Research and Service, University of Oregon, cooperating with the League of Oregon Cities.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Bicycle Control in Metropolitan Cities. Eugene: Portland Branch, Bureau of Municipal Research and Service, University of Oregon, cooperating with the League of Oregon Cities, 1941.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Bicycle Control in Metropolitan Cities. Portland Branch, Bureau of Municipal Research and Service, University of Oregon, cooperating with the League of Oregon Cities, 1941.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.