Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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