@book{51057,
	author = {Van Sickle, Jan.},
	title = {GPS for land surveyors /},
	publisher = {CRC Press,},
	year = {c2008},
	address = {Boca Raton, FL :},
	edition = {3rd ed.},
	url = {http://www.loc.gov/catdir/toc/ecip086/2007050714.html}
}