APA (7th ed.) Citation

Thomas, E. M., & Marsh, L. G. (1959). The harmless people. Vintage Books.

Chicago Style (17th ed.) Citation

Thomas, Elizabeth Marshall, and L. G. Marsh. The Harmless People. New York: Vintage Books, 1959.

MLA (9th ed.) Citation

Thomas, Elizabeth Marshall, and L. G. Marsh. The Harmless People. Vintage Books, 1959.