Traxler, Christian Max Planck Institute for Research on Collective Goods, Max Planck Society;
http://www.coll.mpg.de/pdf_dat/2009_31online.pdf (Preprint)
Fellner, G., Sausgruber, R., & Traxler, C. (2009). Testing Enforcement Strategies in the Field: Legal Threat, Moral Appeal and Social Information.