APA (7th ed.) Citation

Langley, N., & Pynegar, H. (1948). There's a horse in my tree. A. Barker.

Chicago Style (17th ed.) Citation

Langley, Noel, and Hazel Pynegar. There's a Horse in My Tree. London: A. Barker, 1948.

MLA (8th ed.) Citation

Langley, Noel, and Hazel Pynegar. There's a Horse in My Tree. A. Barker, 1948.