Ray, S. Deep focus. HarperCollins.
Dyfyniad Arddull ChicagoRay, Satyajit. Deep Focus. HarperCollins.
Dyfyniad MLARay, Satyajit. Deep Focus. HarperCollins.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.
Ray, S. Deep focus. HarperCollins.
Dyfyniad Arddull ChicagoRay, Satyajit. Deep Focus. HarperCollins.
Dyfyniad MLARay, Satyajit. Deep Focus. HarperCollins.