APA (7th ed.) Citation

Leonard, E. (1977). Unknown man no. 89. Delacorte Press.

Chicago Style (17th ed.) Citation

Leonard, Elmore. Unknown Man No. 89. New York: Delacorte Press, 1977.

MLA (9th ed.) Citation

Leonard, Elmore. Unknown Man No. 89. Delacorte Press, 1977.