ebrary, Inc, & Williams, F. D. (1989). The Northwest Ordinance: Essays on its formulation, provisions, and legacy. Michigan State University Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)ebrary, Inc, و Frederick D. Williams. The Northwest Ordinance: Essays on Its Formulation, Provisions, and Legacy. East Lansing, Mich.: Michigan State University Press, 1989.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)ebrary, Inc, و Frederick D. Williams. The Northwest Ordinance: Essays on Its Formulation, Provisions, and Legacy. Michigan State University Press, 1989.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.