References

References
GARRETT, H. L. 1953. Statistics in psychology and edu- cation. Longmans, Green and Co., New York.
Garrett
Statistics in psychology and education
1953
HERSHEY, J., S. McLOY, A. POWERS, and A. SEXTON, ed. 1972. A curriculum activities guide to water pollution and environmental studies, vol. 1 and 2. Institute for Environmental Education, Cleveland.
Hershey
1
A curriculum activities guide to water pollution and environmental studies
1972
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