@book{20137,
	author = {Mader, Sylvia S., and Windelspecht, Michael,},
	title = {Essentials of biology /},
	publisher = {McGrawhill-hill education, },
	year = {c2015},
	series = {McGraw Hill International editions},
	address = {New York :},
	edition = {4th ed., International student edition /},
	note = {Formerly CIP.}
}