Philippines. National Historical Institute. (1994). Historical markers: Regions V-XII. National Historical Institute.
Chicago-viite (17. p.)Philippines. National Historical Institute. Historical Markers: Regions V-XII. Manila: National Historical Institute, 1994.
MLA-viite (9. p.)Philippines. National Historical Institute. Historical Markers: Regions V-XII. National Historical Institute, 1994.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.