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 . - 7th ed . - Boston : Allyn and Bacon, cop. 2003 . - XXXI, 656 p. : il. gráficos 24 cm
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