- ^ Bill Harry, Beatles - L'enciclopedia, Arcana, Roma 2001, pag. 11.
- John R. Bennett, A catalogue of vocal recordings from the English catalogues of the Gramophone Company 1898-1899, the Gramophone Company Limited 1899 - 1900, the Gramophone & Typewriter Company Limited 1901 - 1907 and the Gramophone Company Limited 1907-1925, Westport, Conn., Greenwood Press, 1978. ISBN 0-313-20237-0
- Alan Kelly, His master's voice - La voce del padrone|the Italian catalogue; a complete numerical catalogue of Italian gramophone recordings made from 1898 to 1929 in Italy and elsewhere by the Gramophone Company Ltd, New York; NY [et al.], Greenwood Press, 1988. ISBN 0-313-26498-8
- Alan Kelly, His master's voice, the French catalogue; a complete numerical catalogue of French gramophone recordings made from 1898 to 1929 in France and elsewhere by the Gramophone Company Ltd, New York; NY [et al.], Greenwood Press, 1990. ISBN 0-313-27333-2
- Alan Kelly, His master's voice, the German catalogue; a complete numerical catalogue of German gramophone recordings made from 1898 to 1929 in Germany, Austria, and elsewhere by The Gramophone Company Ltd, New York; NY [et al.], Greenwood Press, 1994. ISBN 0-313-29220-5
- Alan Kelly, Jacques Klöters, His master's voice, the Dutch catalogue; a complete numerical catalogue of Dutch and Belgian gramophone recordings made from 1900 to 1929 in Holland, Belgium, and elsewhere by the Gramophone Company Ltd, Westport, Conn. [et al.], Greenwood Press, 1997. ISBN 0-313-29883-1
- The voice, the magazine of the Gramophone Co. Ltd, Hayes, Middlesex, 1.1917 - 35.1954