Gall,, Meredith Damien Educational research : an introduction / Meredith D. Gall, Joyce P. Gall, Walter R. Borg

Educational research : an introduction / Meredith D. Gall, Joyce P. Gall, Walter R. Borg . - 8th ed . - Boston : Pearson, cop. 2007 . - XXXI, 672 p. : il. 24 cm
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