@book{41714,
	title = {Biology of four common freshwater snails from vosta beel of Sherpur, Bogra /},
	publisher = {University of Dhaka, },
	year = {2009.},
	address = {Dhaka :},
	note = {Thesis (MS )--Department of Zoology, University of Dhaka, Session : 2002-2003.}
}