References
- Borg , B. R. and Gall , M. 1981 . Educational research , New York : David McKay Company, Inc .
- Bybee , R. W. 1971 . The status of earth science education in secondary schools of Colorado . Colorado Journal of Educational Research , 10 ( 4 ) : 20
- Elkind , David . 1976 . Child development and education , New York : Oxford University Press .
- Hall , C. H. and Wright , E. L. 1980 . Factors influencing the use of suburban school grounds for class-time secondary science instructional activities (ERIC ED186269)
- Hansen , D. P. 1983 . The status of outdoor science education in the public schools of Wyoming , Ph.D. diss. University of Wyoming .
- Mason , J. L. 1980 . Fieldwork in earth science classes . School Science and Mathematics , 80 ( 4 ) : 317 – 322 .
- Piaget , Jean . 1974 . Cognitive development in children: The Piaget papers . Journal of Research in Science Teaching , 2 : 170 – 230 .
- Wall , C. A. and Quib , M. Y. 1972 . Earth science in Wisconsin secondary schools . Journal of Geological Education , 20 ( 2 ) : 84 – 85 .