APA (7th ed.) Citation

Filho, W. L., Palmer, J. A., & Leal, F. W. (1992). Key issues in environmental education. The Horton Print Group.

Chicago Style (17th ed.) Citation

Filho, Walter Leal, Joy A. Palmer, and Filho Water Leal. Key Issues in Environmental Education. [England]: The Horton Print Group, 1992.

MLA (9th ed.) Citation

Filho, Walter Leal, et al. Key Issues in Environmental Education. The Horton Print Group, 1992.