@book{481493,
	author = {Gregory, K. J. and Sage eBooks},
	title = {The Earth's land surface},
	publisher = {SAGE,},
	year = {c2010.},
	address = {London :},
	url = {http://ezproxy.alfaisal.edu/login?url=http://sk.sagepub.com/books/the-earths-land-surface}
}