1. Bank Australii 2007. Payment Costs in Australia. A Study of the Costs of Payment Methods, RBA.
2. Bank Belgii 2005. Costs, Advantages and Drawbacks of the Various Means of Payment, NBB.
3. Bank Belgii 2006. Costs, Advantages and Drawbacks of the Various Means of Payment.Economic Review, June, s. 41–49, NBB.
4. Bank Holandii 2004. The Cost of Payments. Quarterly Bulletin, March, s. 57–64, NVB.
5. Bank Portugalii 2007. Retail Payment Instruments in Portugal: Costs and Benefits, July, BdP.