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References
1.
Cohen
J.
(1988 ). Statistical power analysis for the behavior sciences (2nd Edition ). Hillsdale, NJ : Erlbaum .
2.
Gallagher
J.J.
Coleman
M.R.
Nelson
S.
(1993 ). Cooperative learning as perceived by educators of gifted students and proponents of cooperative education. Chapel Hill , NC : Gifted Education Policy Studies Program, University of North Carolina at Chapel Hill.