Παραπομπή σε μορφή APA (7η εκδ.)

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.

Παραπομπή σε μορφή Chicago (17η εκδ.)

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.

Παραπομπή σε μορφή MLA (9th εκδ.)

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.