@book{60407,
	author = {Youssef, A. S. and Serag, A. M.},
	title = {Survey of scale insects and mealybugs infesting some avocado cultivars and their associated natural enemies in Egypt},
	url = {http://nile.enal.sci.eg/EALE/2015/EJAR/9315/2/389.pdf}
}