@book{2095,
	author = {Hopson, Janet L. and Wessells, Norman K.},
	title = {Essentials of biology /},
	publisher = {McGraw-Hill Companies,},
	year = {1990.},
	address = {[S.l.] :},
	edition = {2nd ed.},
	url = {http://www.amazon.com/exec/obidos/ASIN/0075571080/chopaconline-20}
}