Cabbab, E. C. (1967). Isabela my love: Her history, municipalities and people. s.n.
Chicago-referens (17:e uppl.)Cabbab, Evaristo Cachola. Isabela My Love: Her History, Municipalities and People. [Ilagan, Isabela: s.n, 1967.
MLA-referens (9:e uppl.)Cabbab, Evaristo Cachola. Isabela My Love: Her History, Municipalities and People. s.n, 1967.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.