Dyfyniad APA

(1979). Block [4] data collection procedure. Open University Press.

Dyfyniad Arddull Chicago

Block [4] Data Collection Procedure. Walton Hall: Open University Press, 1979.

Dyfyniad MLA

Block [4] Data Collection Procedure. Open University Press, 1979.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.