Irving, E. M. (1951). Geologic report on the copper-pyrite deposits of Rapu-Rapu Ilsands, Albay Province, P.I. Bureau of Mines.
Lua i Stíl Chicago (17ú heag.)Irving, Earl M. Geologic Report on the Copper-pyrite Deposits of Rapu-Rapu Ilsands, Albay Province, P.I. Manila: Bureau of Mines, 1951.
Lua MLA (9ú heag.)Irving, Earl M. Geologic Report on the Copper-pyrite Deposits of Rapu-Rapu Ilsands, Albay Province, P.I. Bureau of Mines, 1951.
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