@book{9155,
	author = {Singh, Gurcharan},
	title = {Surveying, Volume 1},
	publisher = {Khanna Publishers,},
	year = {1986.},
	address = {India:},
	url = {http://books.google.com.pk/books/about/Surveying.html?id=VGr2GwAACAAJ&redir_esc=y}
}