@book{57861,
	author = {Busch, David D. and ebrary, Inc.},
	title = {David Busch's Canon EOS 50D guide to digital SLR photography},
	publisher = {Course Technology PTR,},
	year = {c2009.},
	address = {Boston, MA :},
	note = {Includes index.},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10314639}
}