1. The casting-counter and the counting-board : a chapter in the history of numismatics and early arithmetic / by Francis Pierrepont Barnard. Barnard, Francis Pierrepont, 1854-1931 Oxford : Clarendon press, 1916. Book Online
2. The gold coinage of Asia before Alexander the Great / by Percy Gardner, Fellow of the Academy. Gardner, Percy, 1846-1937 London : For the British Academy by Henry Frowde, Oxford University Press, 1908 January 29. Book Online
3. The currency of the Farther East from the earliest times up to the present day / by J. H. Stewart Lockhart. Lockhart, James H. Stewart (James Haldane Stewart), Sir, 1858-1937 Hong Kong : Noronha and Company, 1895-1898. Book Online
4. The currencies of the Hindu states of Rájputána / by William Wilfrid Webb (M.B, surgeon captain, Indian Medical Service, Bengal Army). Webb, William Wilfrid, 1857- Westminster : Archibald Constable and Co, 1893. Book Online
5. Histoire monétaire des colonies françaises d'après les documents officiels : avec 278 figures / par E. Zay, membre de la societe francaise de numismatique. Zay, E., 1830 Paris : Typographie de J. Montorier, 1892. Book Online