Pbilippines. Bureau of Coast and Geodetic Survey. (1983). Sta. Marcela, Philippines. Bureau of Coast and Geodetic Survey.
Chicago-referens (17:e uppl.)Pbilippines. Bureau of Coast and Geodetic Survey. Sta. Marcela, Philippines. Manila: Bureau of Coast and Geodetic Survey, 1983.
MLA-referens (9:e uppl.)Pbilippines. Bureau of Coast and Geodetic Survey. Sta. Marcela, Philippines. Bureau of Coast and Geodetic Survey, 1983.
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