Engelhart, M. D. (1972). Methods of educational research. Rand McNally.
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Dyfyniad Arddull Chicago
Engelhart, Max Dissette. Methods of Educational Research. Chicago: Rand McNally, 1972.
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Dyfyniad MLA
Engelhart, Max Dissette. Methods of Educational Research. Rand McNally, 1972.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.