@article{publication-1630,
	author={Torgler, Benno and Frey, Bruno S and Wilson, Clevo},
	doi={10.2202/1935-1682.1929},
	issn={1935-1682},
	journal={B.E. Journal of Economic Analysis & Policy},
	number=1,
	pages={1-39},
	publisher={Berkeley Electronic Press},
	title={Environmental and pro-social norms: evidence on littering},
	volume=9,
	year=2009,
}