Liciniano Saez Demostracion historica del verdadero valor de las monedas, etc. 1805 (Real Acad. de la historia).
Dr. Clemencin On the Ratio in Spain (in Memorias de la Real Academia de la Historia, vol. vi. p. 525).
ENGLAND AND AMERICA
R. Ruding Annals of the Coinage of Britain.
Hawkins Silver Coins of England.
Kenyon Gold Coins of England.
Numismatic Chronicle.
Lord Liverpool Treatise on the Coins of the Realm.
Sir James Stewart Works.