@book{99497,
	author = {Levinson, Ralph, and ebrary, Inc.},
	title = {Teaching science},
	publisher = {Routledge in association with the Open University,},
	year = {1994.},
	series = {The Open University Postgraduate Certificate of Education},
	address = {London ;},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10093952}
}