@book{13394,
	author = {Hobson, E. W. and Jessop, C. M.},
	title = {An elementary treatise on plane trigonometry / },
	publisher = {University Press, },
	year = {1892 (1910 printing ).},
	series = {Pitt press mathematicalseries},
	address = {Cambridge : },
	edition = {1st ed.}
}