[50c] Henri Pirenne, La Civilization occidentale au Moyen Age du milieu du XVe siecle, Paris, 1933
[51] H. Rittershausen, Der Neubau des deutschen Kredit-Systems, Berlin, 1932
[51a] Herbert Rottmann, Deutsche Geldgeschichte 1484–1914, Munich, 1974
[52] Murray N. Rothbatd, What has Government Done to Our Money? New Rev. Edition, Rampart College Publication, Santa Anna, Calif., 1974
[53] Gasparo Scaruffi, l'Alitinonfo per far ragione e concordandanza d'ore e d'argento, Reggio, 1582
[53a] W.A. Shaw, The History of Currency 1252–1894, London, 1894
[54] Adam Smith, Inquiry info the Nature and Causes of the Wealth of Nations [1776], Glasgow edition, Oxford University Press, London, 1976
[55] Vera С. Smith, Rationale of Central Banking P.S. King, London, 1936
[56] Wemer Sombart, Der moderne Kapitalismus, vol. II, 2nd Edition, Munich and Leipzig, 1916/17
[57] Gasparo Scaruffi, Social Statics [1850], Abridged and Rev. Edition, Williams & Norgate, London, 1902
[58] G. Tullock, Über unsere Wahrungsverfassung, Tubingen, 1975
[58a] Brian Summers, «Private Coinage in America», The Freeman, July 1976
[58b] Earl A. Thompson, «The Theory of Money and Income Consistent with Orthodox Value Theory», in P.A. Samuelson and G. Horwich (eds.), Trade, Stability and Macroeconomics. Essays in Honor of Lloyd Metzler, Academic Press, New York and London, 1974
[59] Cordon Tullock, «Taper Money — A Cycle in Cathay», Economic History Review, IX/3, 1956
[60] Gordon Tullock, «Competing Moneys», Money Credit and Banking, 1976
[61] Willem Vissering, «Plans for a European Parallel Currency and SDR Reform», WeltwirtschaftlichesArchiv, 110/2, 1974 [6la] Roland Vaubel, «Freier Wettbewerb Zwischen Wahrungen», Wirtschaftsdienst, August 1976
[62] Willem Vissering, On Chinese Currency. Coin and Paper Money, Leiden, 1877
[63] Knut Wicksell, Geldzins und Guterpreise, Jena, 1898
[64] Knut Wicksell, Vorlesungen über Nationalokonomie [1922], English Ed., Lectures on Political Economy, vol. II: Money, Routledge, 1935
[64a] Leiand B. Yeager, «Essential Properties of the Medium of Exchange», Kyklos, 21, 1968.
