Philippines. Bureau of Mines. Annual report - Bureau of Mines. Bureau of Mines.
Citazione stile Chigago Style (17a edizione)Philippines. Bureau of Mines. Annual Report - Bureau of Mines. Manila: Bureau of Mines.
Citatione MLA (8a ed.)Philippines. Bureau of Mines. Annual Report - Bureau of Mines. Bureau of Mines.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.