India. Centre for Environment Education, Vikram A. Sarabhai Community Science Centre, VIKSAT, India. Darpana Academy of Performing Arts, & India. National Council of Educational Research and Training. (1986). Joy of learning: Handbook of environmental education activities. Centre for Environment Education.
Lua i Stíl Chicago (17ú heag.)India. Centre for Environment Education, Vikram A. Sarabhai Community Science Centre, VIKSAT, India. Darpana Academy of Performing Arts, agus India. National Council of Educational Research and Training. Joy of Learning: Handbook of Environmental Education Activities. Thaltej Tekra, Ahmedabad: Centre for Environment Education, 1986.
Lua MLA (9ú heag.)India. Centre for Environment Education, et al. Joy of Learning: Handbook of Environmental Education Activities. Centre for Environment Education, 1986.