@book{203032,
	author = {Norton, Dora Miriam.},
	title = {Freehand perspective and sketching},
	publisher = {Dover Publications},
	year = {2006.},
	address = {Mineola, N.Y.},
	edition = {Dover ed.},
	note = {Originally published: 8th ed. Brooklyn : D.M. Norton, 1925.},
	url = {http://www.loc.gov/catdir/enhancements/fy0664/2005054779-d.html}
}