@book{511,
	author = {World Health Organization. International Reference Centre for Community Water Supply.},
	title = {Plastic pipe in drinking water distribution practice : introduction and bibliography up to 1970.},
	publisher = {World Health Organization International Reference Centre for Community Water Supply,},
	year = {1971.},
	series = {(Its: Technical paper ; no. 1)},
	address = {The Hague : }
}