@book{16947,
	author = {Snell,Foster Dee, and  Cornelitia T.Snell },
	title = {Colori,etric methods of analysis:including some turbidimetric and nephelometric methods},
	publisher = {D.Van Nostrand Co.},
	year = {1937},
	address = {London},
	edition = {3rd ed.}
}