Wilke, Richard J. Strategies for the training of teachers in environmental education / Richard J. Wilke, R. Ben Peyton, Harold R. Hungerford. - [Paris]: Unesco, 1987. - 152 p. : ill. ; 30 cm. - 25 . Unesco-UNEP International Environmental Education Programme Subjects--Topical Terms: Environmental protectionEnvironmental education Dewey Class. No.: 363.7