Philippines. Division of Geology and Mines & Philippines. Division of Geology and Mines. (1910). The mineral resources of the Philippine Islands: With a statement of the production of commercial mineral products during the year 1909. Bureau of Printing.
Չիկագոյի ոճի (17րդ խմբ.) մեջբերումPhilippines. Division of Geology and Mines and Philippines. Division of Geology and Mines. The Mineral Resources of the Philippine Islands: With a Statement of the Production of Commercial Mineral Products During the Year 1909. Manila: Bureau of Printing, 1910.
MLA (8րդ խմբ.) ՄեջբերումPhilippines. Division of Geology and Mines and Philippines. Division of Geology and Mines. The Mineral Resources of the Philippine Islands: With a Statement of the Production of Commercial Mineral Products During the Year 1909. Bureau of Printing, 1910.