@unpublished{publication-5655,
	author={Meier, Stephan and Stutzer, Alois},
	institution={University of Zurich},
	issn={1424-0459},
	number={No. 180},
	series={Working paper series / Institute for Empirical Research in Economics},
	title={Is Volunteering Rewarding in Itself?},
	year=2004,
}