1. Doerig H.U.: Operational Risks in Financial Services: An Old Challenge in a New Environment, Working Paper, Credit Suisse Group (2003)
2. Spedding, L., Rose, A.: Business Risk Management Handbook – A sustainable approach. CIMA Publishing, USA (2008)
3. Lütkebohmert, E.: Concentration Riskin Credit Portfolios, p. 5. Springer-Verlag Publisher, Berlin (2009) e-ISBN 978-3-540-70870-4
4. Bank for International Settlements: Long-Term Rating Scales Comparison (2005)
5. Global Association of Risk Professionals: Operational Risk Management, ch. 12, http://www.garp.org/media/673303/operational%20risk%20slides.pdf