@book{21701,
	author = {Giblin, P. J.},
	title = {Graphs, surfaces and homology /},
	publisher = {Cambridge University Press,},
	year = {c2010.},
	address = {Cambridge ;},
	edition = {3rd ed.},
	url = {http://assets.cambridge.org/97805217/66654/cover/9780521766654.jpg}
}