APA (7th ed.) Citation

Tivy, J., & O'Hare, G. (1982). Human impact on the ecosystem. Oliver & Boyd.

Chicago Style (17th ed.) Citation

Tivy, Joy, and Greg O'Hare. Human Impact on the Ecosystem. Edinburgh, New York: Oliver & Boyd, 1982.

MLA (9th ed.) Citation

Tivy, Joy, and Greg O'Hare. Human Impact on the Ecosystem. Oliver & Boyd, 1982.