Wiersma, W. (1985). Research methods in education: An introduction (3rd ed., rev. print.). Allyn and Bacon.
Cita Chicago (17th ed.)Wiersma, William. Research Methods in Education: An Introduction. 3rd ed., rev. print. Boston: Allyn and Bacon, 1985.
Cita MLA (8th ed.)Wiersma, William. Research Methods in Education: An Introduction. 3rd ed., rev. print. Allyn and Bacon, 1985.
Atenció: Aquestes cites poden no estar 100% correctes.