Willoughby, W. F. (1927). Principles of public administration: With special reference to the national and state governments of the United States. The Johns Hopkins Press.
Lua i Stíl Chicago (17ú heag.)Willoughby, William Franklin. Principles of Public Administration: With Special Reference to the National and State Governments of the United States. Baltimore, Md: The Johns Hopkins Press, 1927.
Lua MLA (9ú heag.)Willoughby, William Franklin. Principles of Public Administration: With Special Reference to the National and State Governments of the United States. The Johns Hopkins Press, 1927.
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