Vacca, Maria Luisa. "Comune di Napoli -Gemellaggi" [Naples – Twin Towns]. Comune di Napoli (in Italian). Archived from the original on July 22, 2013. Retrieved August 8, 2013.
guije.com
Guije.com. "Palma Soriano" (in Spanish). Archived from the original on September 30, 2007. Retrieved October 5, 2007.
Vacca, Maria Luisa. "Comune di Napoli -Gemellaggi" [Naples – Twin Towns]. Comune di Napoli (in Italian). Archived from the original on July 22, 2013. Retrieved August 8, 2013.
"Town Twinning Agreements". Municipalidad de Rosario – Buenos Aires 711. Archived from the original on March 19, 2015. Retrieved October 14, 2014.