Philippines. National Historical Institute. (1994). Historical markers: Regions V-XII. National Historical Institute.
Chicago-referens (17:e uppl.)Philippines. National Historical Institute. Historical Markers: Regions V-XII. Manila: National Historical Institute, 1994.
MLA-referens (9:e uppl.)Philippines. National Historical Institute. Historical Markers: Regions V-XII. National Historical Institute, 1994.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.