APA (7th ed.) Citation

Warner, G. C., & Cunningham, D. (1969). Tree house mystery. A. Whitman.

Chicago Style (17th ed.) Citation

Warner, Gertrude Chandler, and David Cunningham. Tree House Mystery. Chicago: A. Whitman, 1969.

MLA (9th ed.) Citation

Warner, Gertrude Chandler, and David Cunningham. Tree House Mystery. A. Whitman, 1969.