APA (7th ed.) Citation

White, T. H. (1939). The once and future king. G.P. Putnam's Sons.

Chicago Style (17th ed.) Citation

White, T. H. The Once and Future King. New York: G.P. Putnam's Sons, 1939.

MLA (9th ed.) Citation

White, T. H. The Once and Future King. G.P. Putnam's Sons, 1939.