APA (7th ed.) Citation

Du Bois, W. P. (1975). The Twenty-one balloons. The Viking Press.

Chicago Style (17th ed.) Citation

Du Bois, Williams Pene. The Twenty-one Balloons. New York: The Viking Press, 1975.

MLA (9th ed.) Citation

Du Bois, Williams Pene. The Twenty-one Balloons. The Viking Press, 1975.