(1971). Pollution by detergents. Paris: OCDE.
Dyfyniad Arddull ChicagoPollution By Detergents. Paris: OCDE, 1971.
Dyfyniad MLAPollution By Detergents. Paris: OCDE, 1971.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.
(1971). Pollution by detergents. Paris: OCDE.
Dyfyniad Arddull ChicagoPollution By Detergents. Paris: OCDE, 1971.
Dyfyniad MLAPollution By Detergents. Paris: OCDE, 1971.