@book{21169,
	author = {Inglis, Mike },
	title = {Observer’s Guide to Star Clusters},
	publisher = {Springer New York},
	year = {2013},
	series = {The Patrick Moore Practical Astronomy Series},
	address = {New York},
	url = {http://doi.org/10.1007/978-1-4614-7567-5}
}