The book has given me answers and insights to questions I had about money and about our monetary system. I would like to receive a source reference where the information, for example legislation, can be found that is described (p. 60/61) and is essential for the statements that are made. {Publisher's response} The article of law can be found in the Financial Supervision Act (WFT): Section 4.3.1.2 Electronic Money, Article 4:31. Thank you for your question, we will try to include this information in the next edition. {End publisher's response}