1. The Market for "Lemons": Quality Uncertainty and the Market Mechanism
2. Becker, T. (1997), “Quality policy and consumer behaviour”, in Schiefer, G. and Helbig, R. (Eds), Quality Management and Process Improvement for Competitive Advantage in Agriculture and Food, Vol. 1, Proceedings of the 49th Seminar of the European Association of Agricultural Economists (EAAE), February, Bonn.
3. Bund für Lebensmittelrecht und Lebensmittelkunde e.V. (BLL) (Ed.) (1998), Das gemeinschaftliche Lebensmittelrecht, Bonn.
4. Free Competition and the Optimal Amount of Fraud
5. Deutsche Gesellschaft für Qualität (Ed.) (1980), Begriffe und Formalzeichen im Bereich der Qualitätssicherung, Schrift Nr. 11‐04.