@book{33948,
	author = {Handy, Richard. and Moody, David B. and SpringerLink (Online service)},
	title = {Astronomical Sketching: A Step-by-Step Introduction},
	publisher = {Springer New York,},
	year = {2007.},
	series = {Patrick Moore's Practical Astronomy Series,},
	address = {New York, NY :},
	url = {http://dx.doi.org/10.1007/978-0-387-68696-7}
}