@book{47799,
	author = {El-Sharkawy, Gehan. A. and Saleh, Abdel-Razzak H.},
	title = {Response of cabbage plants (Brassica oleraceae var. capitata L. ) to fertilization with chicken manure, mineral nitrogen fertilizer and humic acid},
	url = {http://nile.enal.sci.eg/EALE/2010/ASEJ/3110/4/416.pdf}
}