Del Prado, M. G. (1960). "A short history of the district of Albay". s.n.
Lua i Stíl Chicago (17ú heag.)Del Prado, Mariano Goyena. "A Short History of the District of Albay". s.l: s.n, 1960.
Lua MLA (8ú heag.)Del Prado, Mariano Goyena. "A Short History of the District of Albay". s.n, 1960.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.