APA (7th ed.) Citation

Berry, P. S., & Lydford, C. (1990). Guide to resources in environmental education (11th ed.). The Conservation Trust.

Chicago Style (17th ed.) Citation

Berry, Peter S., and Catherine Lydford. Guide to Resources in Environmental Education. 11th ed. Reading, Eng.: The Conservation Trust, 1990.

MLA (9th ed.) Citation

Berry, Peter S., and Catherine Lydford. Guide to Resources in Environmental Education. 11th ed. The Conservation Trust, 1990.