Philippines Bureau of Coast and Geodetic Survey. (1986). Daet. Philippine Coast and Geodetic Survey.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPhilippines Bureau of Coast and Geodetic Survey. Daet. Manila: Philippine Coast and Geodetic Survey, 1986.
एमएलए (9वां संस्करण) प्रशस्ति पत्रPhilippines Bureau of Coast and Geodetic Survey. Daet. Philippine Coast and Geodetic Survey, 1986.
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