Wiersma, W. (1995). Research methods in education: An introduction (6th ed.). Allyn and Bacon.
Lua i Stíl Chicago (17ú heag.)Wiersma, William. Research Methods in Education: An Introduction. 6th ed. Boston: Allyn and Bacon, 1995.
Lua MLA (9ú heag.)Wiersma, William. Research Methods in Education: An Introduction. 6th ed. Allyn and Bacon, 1995.
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