@book{1177,
	author = {S K Duggal},
	title = {Surveying/},
	publisher = {McGraw Hill,},
	year = {2015.},
	address = {New Delhi:},
	edition = {v.1,4th ed.},
	url = {http://www.mheducation.co.in/9781259028991-india-surveying-vol-i}
}