@book{20899,
	author = {Frey, Ulrich J.  and  Kai P. Willführ},
	title = {Essential Building Blocks of Human Nature},
	publisher = {Springer Berlin Heidelberg},
	year = {2011},
	series = {The Frontiers Collection},
	address = {Heidelberg, Berlin},
	url = {http://doi.org/10.1007/978-3-642-13968-0}
}