Carlos Franco-Paredes; Lorena Lammoglia; José Ignacio Santos-Preciado (2005). “The Spanish Royal Philanthropic Expedition to bring Smallpox vaccination to the New World and Asia in the 19th Century”. Clinical Infectious Diseases. Oxford Journals. 41 (9): 1285–1289. doi:10.1086/496930. PMID16206103.
Edward J. Olszewski (1999). “Exorcising Goya's "The Family of Charles IV"”. Artibus et Historiae. 20 (40): 169–185. doi:10.2307/1483673. JSTOR1483673.
Carlos Franco-Paredes; Lorena Lammoglia; José Ignacio Santos-Preciado (2005). “The Spanish Royal Philanthropic Expedition to bring Smallpox vaccination to the New World and Asia in the 19th Century”. Clinical Infectious Diseases. Oxford Journals. 41 (9): 1285–1289. doi:10.1086/496930. PMID16206103.