"Contemporary Private Monetary Systems." Pp. 213-253 in L. H. White, V. J. Vanberg and E. A. Köhler (eds), Renewing the Search for a Monetary Constitution, Cato Institute, Washington DC, 2015.
"Free Banking." Pp. 213-244 in P. J. Boettke and C. J. Coyne (eds) The Oxford Handbook of Austrian Economics, Oxford: Oxford University Press, 2015.
New Private Monies - a Bit Part Player? London: Institute of Economic Affairs, 2014.
Private Money - the Path to Monetary Stability, London: Institute of Economic Affairs Hobart Paper 112, 1988. This was subsequently translated into Italian and published as Abolire le Banche Centrali by the Istituto Bruno Leoni in 2009.