@book{60631,
	author = {Elwan, Mohammed W. M.  and Elhamahmy, M. A.},
	title = {Yield and quality of spinach and parsley affected by nitrogen fertilizer sources and di-potassium hydrogen ortho-phosphate},
	url = {http://nile.enal.sci.eg/EALE/2015/ZJAR/4215/4/683.pdf}
}