Feld, L. P., & Larsen, C. (2012). Undeclared Work, Deterrence and Social Norms: The Case of Germany. Springer Berlin Heidelberg. https://doi.org/10.1007/978-3-540-87401-0

Feld, Lars P., and Claus Larsen. Undeclared Work, Deterrence and Social Norms: The Case of Germany. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. https://doi.org/10.1007/978-3-540-87401-0.

Feld, Lars P., and Claus Larsen. Undeclared Work, Deterrence and Social Norms: The Case of Germany. Springer Berlin Heidelberg, 2012. https://doi.org/10.1007/978-3-540-87401-0.