Environmental education at the school level : a lead paper presented at the International Conference on Environmental Education, New Delhi, 16-20 December 1981.

“…International Conference on Environmental Education…”

Environmental education and sustainable development: proceedings of the third International Conference on Environmental Education, held at Goa on 3-7 October 1989

“…International Conference on Environmental Education…”

Education for environmental planning and conservation : proceedings

“…International Conference on Environmental Education Organized by Indian Environmental Society and Department of Environment held at Stockholm in June, 1972…”