@book{1196,
	author = {Duggal, S. K.},
	title = {Building materials},
	publisher = {New Age International Publishers,},
	year = {2012.},
	address = {New Delhi :},
	edition = {4th ed.},
	url = {http://www.newagepublishers.com/servlet/nagetbiblio?bno=000109}
}