APA (7th ed.) Citation

Gardner, E. S. (1976). The case of the sleepwalker's niece. Aeonian Press.

Chicago Style (17th ed.) Citation

Gardner, Erle Stanley. The Case of the Sleepwalker's Niece. Mattituck, N.Y.: Aeonian Press, 1976.

MLA (8th ed.) Citation

Gardner, Erle Stanley. The Case of the Sleepwalker's Niece. Aeonian Press, 1976.

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