APA (7th ed.) Citation

Willoughby, W. F. (1918). The problem of a national budget. D. Appleton.

Chicago Style (17th ed.) Citation

Willoughby, William F. The Problem of a National Budget. New York ; London: D. Appleton, 1918.

MLA (9th ed.) Citation

Willoughby, William F. The Problem of a National Budget. D. Appleton, 1918.