National Municipal League. Committee on Metropolitan Government & Studenski, P. (1930). The government of metropolitan areas in the United States. National municipal league.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)National Municipal League. Committee on Metropolitan Government و Paul Studenski. The Government of Metropolitan Areas in the United States. New York: National municipal league, 1930.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)National Municipal League. Committee on Metropolitan Government و Paul Studenski. The Government of Metropolitan Areas in the United States. National municipal league, 1930.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.