Cita APA (7a ed.)
Wiersma, W. (1969). Research methods in education: An introduction.
Cita estilo Chicago (17a ed.)
Wiersma, William. Research Methods in Education: An Introduction. 1969.
Cita MLA (9a ed.)
Wiersma, William. Research Methods in Education: An Introduction. 1969.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.