ebrary, Inc, & Williams, F. D. (1989). The Northwest Ordinance: Essays on its formulation, provisions, and legacy. Michigan State University Press.
芝加哥风格引文ebrary, Inc, 与 Frederick D. Williams. The Northwest Ordinance: Essays on Its Formulation, Provisions, and Legacy. East Lansing, Mich.: Michigan State University Press, 1989.
MLA引文ebrary, Inc, 与 Frederick D. Williams. The Northwest Ordinance: Essays on Its Formulation, Provisions, and Legacy. Michigan State University Press, 1989.
警告：这些引文格式不一定是100％准确.