@book{30253,
	author = {Machholz, Don, and ebrary, Inc.},
	title = {The observing guide to the Messier marathon},
	publisher = {Cambridge University Press,},
	year = {2002.},
	address = {Cambridge, UK ;},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10069901}
}