References

References
HARMS, N.C., and YAGER, R.E. (eds.) 1981. What research says to the science teacher. Washington, D.C.: Na- tional Science Teachers Association.
Harms
What research says to the science teacher
1981
HURD, P.D. 1982. Biology for life and living: perspectives for the 1980s. In Hickman, F.M., and J.B. Kahle (eds.) New directions in biology teaching: Perspectives for the 1980s. Reston, Va.: National Association of Biology Teachers.
Hurd
Biology for life and living: perspectives for the 1980s
New directions in biology teaching: Perspectives for the 1980s
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NATIONAL ASSESSMENT OF EDU- CATIONAL PROGRESS. 1978. Three national assessments of science: Changes in achievement, 1969-77. Denver, Col.: Education Commission of the States.
National Assessment Of Educational Progress
Three national assessments of science: Changes in achievement, 1969-77
1978
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