APA (7th ed.) Citation

Rorke, L. R., Saunders, M., & Stark, W. R. (1931). Lefty: The story of a boy and a dog. T. Nelson.

Chicago Style (17th ed.) Citation

Rorke, Louise Richardson, Marshall Saunders, and W. R. Stark. Lefty: The Story of a Boy and a Dog. Toronto: T. Nelson, 1931.

MLA (9th ed.) Citation

Rorke, Louise Richardson, et al. Lefty: The Story of a Boy and a Dog. T. Nelson, 1931.