@book{15076,
	author = {Achtenhagen, Frank,},
	title = {Teachers' Professional Development :},
	publisher = {Brill | Sense,},
	year = {2009.},
	series = {Educational Research E-Books Online, Collection 2005-2017, ISBN: 9789004394001},
	address = {Leiden, },
	url = {http://dx.doi.org/10.1163/9789087907419}
}