ebrary, Inc. (2006). PE pipe: Design and installation. American Water Works Association.
Dyfyniad Arddull Chicagoebrary, Inc. PE Pipe: Design and Installation. Denver, Colo.: American Water Works Association, 2006.
Dyfyniad MLAebrary, Inc. PE Pipe: Design and Installation. American Water Works Association, 2006.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.