Philippines (Republic). Bureau of the Census and Statistics. Report. [s.n.
Chicago-viite (17. p.)Philippines (Republic). Bureau of the Census and Statistics. Report. Manila: [s.n.
MLA-viite (9. p.)Philippines (Republic). Bureau of the Census and Statistics. Report. [s.n.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.