@book{19059,
	author = {Hartman, John Richard, and Pirone, T. P. and ebrary, Inc.},
	title = {Pirone's tree maintenance},
	publisher = {Oxford University Press,},
	year = {2000.},
	address = {Oxford ;},
	edition = {7th ed.},
	note = {Rev. ed. of: Tree maintenance / P.P. Pirone ... [et al.].  6th ed. 1988.},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10278103}
}