BognerF. X. (1998). The influence of short-term outdoor ecology education on long-term variables of environmental perspective.J. Environmental Education, 29 (4), 17–29.
2.
CappsF. O. (1940). A survey of the conservation information possessed by pupils in Missouri high schools.Science Education, 24 (2), 1–10.
3.
LeemingF. C., PorterB. E., DwyerW. O., CobernM. D., & OliverD. P. (1997). Effects of participation in class activities on children's environmental attitudes and knowledge.J. Environmental Education, 28 (2), 22–26.
4.
MusserL. M., & MalkusA.J. (1994). The children's attitudes toward the environmental scale.J. Environmental Education, 25 (3), 22–26.
