Western Wood Products Association. (1973). Western woods use book. Portland, Or.
Dyfyniad Arddull ChicagoWestern Wood Products Association. Western Woods Use Book. Portland, Or, 1973.
Dyfyniad MLAWestern Wood Products Association. Western Woods Use Book. Portland, Or, 1973.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.