@book{52400,
	author = {Varkonyi, Robert. and ebrary, Inc.},
	title = {Drupal Rules how-to},
	publisher = {Packt Pub.,},
	year = {2012.},
	address = {Birminghan, UK :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10632716}
}