Глассе, A. (1985). «Лepмoнтoвcкий пeтepБypг n дeпeшax BюpтeмБepгcкoгo пocлaнниka (по материалам Штутгартского архива)». Лермонтовский сборник(en ruso) (Moscú: Наука). pp. 290-291. Consultado el 28 de septiembre de 2015. «Parmi les assistants de notre petite fête s’est trouvé aussi le Marquis de Villafranca, le Duc de Medina-Sidonia et Fernandina, venu en Russie, à ce qu’on m’assure, pour négocier des subsides pour Don Carlos d'Espagne: il serait, me dit-on, porteur d’une lettre de ce Prince pour Sa Majesté l'Empereur».
forgottenbooks.com
Dallas, George M. (2013) [1892]. Diary of George Mifflin Dallas, while United States Minister to Russia 1837(en inglés). Londres: Forgotten Books. pp. 40-41. Archivado desde el original el 24 de septiembre de 2015. Consultado el 28 de agosto de 2015. «Marquis de Villafranca and I, after being introduced, had a long and interesting confab. He is not an unapt looking representative of the Spanish Pretender, Don Carlos. Of about forty years of age, short figure, round limbs, jet-black hair and eyes, bushy moustache, and swarthy complexion, he looks the young but grave grandee. He has heretofore represented his country at Naples and Vienna in different capacities, and has now been absent from it for eight years. He is modest and unassuming, and seemed quite conscious of the peculiarity of his position here».
«Partida de bautismo (Madrid, 11-05-1803). Copia certificada (1858-05-05)». Expediente personal del Marqués de Villafranca y Duque de Medina Sidonia, D. Pedro de Alcántara Álvarez de Toledo Palafox, prócer (no juró) y Senador por derecho propio. Senado de España. Consultado el 28 de agosto de 2015.
Dallas, George M. (2013) [1892]. Diary of George Mifflin Dallas, while United States Minister to Russia 1837(en inglés). Londres: Forgotten Books. pp. 40-41. Archivado desde el original el 24 de septiembre de 2015. Consultado el 28 de agosto de 2015. «Marquis de Villafranca and I, after being introduced, had a long and interesting confab. He is not an unapt looking representative of the Spanish Pretender, Don Carlos. Of about forty years of age, short figure, round limbs, jet-black hair and eyes, bushy moustache, and swarthy complexion, he looks the young but grave grandee. He has heretofore represented his country at Naples and Vienna in different capacities, and has now been absent from it for eight years. He is modest and unassuming, and seemed quite conscious of the peculiarity of his position here».