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Fraenkel, J, R., Wallen, N, E. (2006). How To Design And Evaluate Research In Education (6). Singapore: Mc Graw-Hill Book Co..

Gaya MLA

Fraenkel, Jack, R.., Wallen, Norman, E.. "How To Design And Evaluate Research In Education". 6 Singapore: Mc Graw-Hill Book Co., 2006. Text.