Philippines (Republic). Bureau of Mines. Report. [s.n.
Chicago Style (17th ed.) CitationPhilippines (Republic). Bureau of Mines. Report. Manila: [s.n.
MLA引文Philippines (Republic). Bureau of Mines. Report. [s.n.
警告:这些引文格式不一定是100%准确.
Philippines (Republic). Bureau of Mines. Report. [s.n.
Chicago Style (17th ed.) CitationPhilippines (Republic). Bureau of Mines. Report. Manila: [s.n.
MLA引文Philippines (Republic). Bureau of Mines. Report. [s.n.