APA (7th ed.) Citation

Hansen, E., & Sutton, J. (1990). A family of tortoises. A & C Black.

Chicago Style (17th ed.) Citation

Hansen, Elvig, and Jane Sutton. A Family of Tortoises. London: A & C Black, 1990.

MLA (9th ed.) Citation

Hansen, Elvig, and Jane Sutton. A Family of Tortoises. A & C Black, 1990.