Dyfyniad APA

Wahlberg. Good Quality. University of California Press.

Dyfyniad Arddull Chicago

Wahlberg. Good Quality. University of California Press.

Dyfyniad MLA

Wahlberg. Good Quality. University of California Press.

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