@book{10291,
	author = {Ian Heywood and Sarah Cornelius},
	title = {Introduction to Geographical Information Systems},
	publisher = {Pearson},
	year = {2011},
	address = {New Delhi},
	edition = {4th},
	url = {https://ebookcentral.proquest.com/lib/gzsptuc/detail.action?docID=5138011&query=Introduction+to+Geographical+Information+Systems}
}