Caldez, E. (2001). 28 Cagayan towns listed as hot spots. Philippine Daily Inquirer.
Chicago-referens (17:e uppl.)Caldez, Estanislao. "28 Cagayan Towns Listed as Hot Spots." Philippine Daily Inquirer 2001.
MLA-referens (9:e uppl.)Caldez, Estanislao. "28 Cagayan Towns Listed as Hot Spots." Philippine Daily Inquirer, 2001.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.