seven classics in monetary economics 

1. Lombard street: A description of the money market by Walter Bagehot [1873]
2. Interest and prices by Knut Wicksell [1898]
3. Philosophy of money by Georg Simmel [1900]
4. A treatise on money by John Maynard Keynes [1930]
5. Money, interest and prices by Don Patinkin [1956]
6. Interest and prices by Michael Woodford [2003]
7. Nature of money by Geoffrey Ingham [2004]