Harvard university. Graduate school of public administration, Friedrich, C. J., & Mason, E. S. (1940). Public policy: A yearbook of the Graduate School of Public Administration, Harvard University, 1940-. Harvard University Press.
Trích dẫn kiểu Chicago (xuất bản lần thứ 7)Harvard university. Graduate school of public administration, Carl Joachim Friedrich, và Edward Sagendorph Mason. Public Policy: A Yearbook of the Graduate School of Public Administration, Harvard University, 1940-. Cambridge, Mass: Harvard University Press, 1940.
Trích dẫn kiểu MLA (xuất bản lần thứ 9)Harvard university. Graduate school of public administration, et al. Public Policy: A Yearbook of the Graduate School of Public Administration, Harvard University, 1940-. Harvard University Press, 1940.
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