@book{133105,
	author = {Frost, Percival. and Bell, R. J. T.},
	title = {An elementary treatise on curve tracing},
	publisher = {Macmillan,},
	year = {1918.},
	address = {London,},
	edition = {4th ed.},
	url = {http://catalog.hathitrust.org/api/volumes/oclc/4905042.html}
}