1. Uitto, A.; Juuti, K.; Lavonen, J.; Byman, R.; Meisalo, V.: Environmental Education Research, 17 (2), 167–186 (2011).
2. DeLaughter, J. E.; Stein, S.; Stein, C.A.; Bain, K.R.: EOS, 79 (36), 429–436 (1998).
3. UNESCO (1978) Intergovernmental Conference on Environmental Education, Final Report, UNESCO-UNEP, Tbilisi
4. Stapp, W.B.: Environmental Education. 1 (1), 30–31 (1969).
5. Bennett, B.D.: Evaluating Environmental Education in Schools, A practical guide for teachers, UNESCO Division of Science, Technical and Environmental Education, pp. 71–82 (1984).