@book{33861,
	author = {Mullaney, James. and SpringerLink (Online service)},
	title = {The Herschel Objects and How to Observe Them},
	publisher = {Springer New York,},
	year = {2007.},
	series = {Astronomers' Observing Guides,},
	address = {New York, NY :},
	url = {http://dx.doi.org/10.1007/978-0-387-68125-2}
}