Gall, M. D., Gall, J. P., & Borg, W. R. (2007). Educational research: An introduction (Eight edition.). Pearson/Allyn & Bacon.
Cita Chicago Style (17a ed.)Gall, Meredith D., Joyce P. Gall, y Walter R. Borg. Educational Research: An Introduction. Eight edition. Boston: Pearson/Allyn & Bacon, 2007.
Cita MLA (9a ed.)Gall, Meredith D., et al. Educational Research: An Introduction. Eight edition. Pearson/Allyn & Bacon, 2007.
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