APA (7th ed.) Citation

Tivy, J., O'hare, G., Rooke, A., & Skinner, A. (1981). Human impact on the ecosystem. Oliver & Boyd.

Chicago Style (17th ed.) Citation

Tivy, Joy, Greg O'hare, Ann Rooke, and Andy Skinner. Human Impact on the Ecosystem. Edinburg: Oliver & Boyd, 1981.

MLA (9th ed.) Citation

Tivy, Joy, et al. Human Impact on the Ecosystem. Oliver & Boyd, 1981.