APA (7th ed.) Citation

Conservation Trust, Berry, P. S., & Lydford, C. (1990). Guide to resources in environmental education (11th ed.). Library Association Publishing in conjunction with the Conservation Trust.

Chicago Style (17th ed.) Citation

Conservation Trust, Peter S. Berry, and Catherine Lydford. Guide to Resources in Environmental Education. 11th ed. London: Library Association Publishing in conjunction with the Conservation Trust, 1990.

MLA (9th ed.) Citation

Conservation Trust, et al. Guide to Resources in Environmental Education. 11th ed. Library Association Publishing in conjunction with the Conservation Trust, 1990.