Wiersma, W. (1975). Research methods in education: An introduction (4th ed.). Allyn.
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Dyfyniad Arddull Chicago
Wiersma, William. Research Methods in Education: An Introduction. 4th ed. Boston: Allyn, 1975.
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Dyfyniad MLA
Wiersma, William. Research Methods in Education: An Introduction. 4th ed. Allyn, 1975.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.