1. Avery R et al. 1985. Cash and transaction account usage by American households. Board of Governors of the Federal Reserve System.
2. Boeschoten WC and Fase MMG. 1984. Betalingsverkeer en officieuze economie in Nederland 1965–1982. De Nederlandsche Bank n.v., monetaire monografieeen, 1.
3. Cramer JS. 1981a. The work money does: the transactions velocity of circulation of money in the Netherlands, 1950–1978. European Economic Review, 15: 307–326.
4. Cramer JS. 1981b. The volume of transactions and of payments in the United Kingdom 1968-1977. Oxford Economic Papers, N.S. 33: 234–255.
5. Cramer JS. 1986. The volume of transactions and the circulation of money in the United States 1950–1979. The Journal of Business and Economic Statistics, 4: 225–223.