APA (7th ed.) Citation

Willoughby, W. F. (1921). An introduction to the study of the government of modern states. Century Co..

Chicago Style (17th ed.) Citation

Willoughby, William F. An Introduction to the Study of the Government of Modern States. New York: Century Co., 1921.

MLA (9th ed.) Citation

Willoughby, William F. An Introduction to the Study of the Government of Modern States. Century Co., 1921.

Warning: These citations may not always be 100% accurate.