@book{570550,
	author = {Gregory S},
	title = {Statistical methods and the Geographer Ed. 3},
	publisher = {Longman          },
	year = {1973},
	series = {Geographies for the advanced study. Ed. by Stanley H Beaver},
	address = {London},
	edition = {Ed. 3},
	note = {Bibliography : P252-60}
}