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Goodwin, John (1842). "Progress of the Two Sicilies Under the Spanish Bourbons, from the Year 1734-35 to 1840". Journal of the Statistical Society of London. 5 (1): 47–73. doi:10.2307/2337950. ISSN0959-5341. JSTOR2337950.
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Goodwin, John (1842). "Progress of the Two Sicilies Under the Spanish Bourbons, from the Year 1734-35 to 1840". Journal of the Statistical Society of London. 5 (1): 47–73. doi:10.2307/2337950. ISSN0959-5341. JSTOR2337950.
Thomson, D. W. (April 1995). "Prelude to the Sulphur War of 1840: The Neapolitan Perspective". European History Quarterly. 25 (2): 163–180. doi:10.1177/026569149502500201. S2CID145807900.
Goodwin, John (1842). "Progress of the Two Sicilies Under the Spanish Bourbons, from the Year 1734-35 to 1840". Journal of the Statistical Society of London. 5 (1): 47–73. doi:10.2307/2337950. ISSN0959-5341. JSTOR2337950.