Cita APA (7a ed.)

Gardner, E. S. The Case of the Sleepwalker's Niece. Pocket Books.

Cita Chicago Style (17a ed.)

Gardner, Erle Stanley. The Case of the Sleepwalker's Niece. New York: Pocket Books.

Cita MLA (9a ed.)

Gardner, Erle Stanley. The Case of the Sleepwalker's Niece. Pocket Books.