(1960). Background and foreground. Great Neck, N.Y: Channel Press.
Dyfyniad Arddull ChicagoBackground and Foreground. Great Neck, N.Y: Channel Press, 1960.
Dyfyniad MLABackground and Foreground. Great Neck, N.Y: Channel Press, 1960.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.