* Carl Menger, "On the Origin of Money"* Nobuhiro Kiyotaki and Randall Wright (1989), 'On money as a medium of exchange', "Journal of Political Economy" 97, pp.
* Carl Menger, "On the Origin of Money"* Nobuhiro Kiyotaki and Randall Wright (1989), 'On money as a medium of exchange', "Journal of Political Economy" 97, pp.