@book{57685,
	author = {"Comber, N.M., Jones, H.F. & Willcox, J.S."},
	title = {"Introduction to agricultural chemistry, 3rd edition revised by J.S.Willcox and W.N. Townsend)"},
	publisher = {Edward Arnold(Pub)Ltd.},
	year = {London},
	address = {1964}
}