APA (7 वां संस्करण) प्रशस्ति पत्र

Philippines. Bureau of Coast and Geodetic Survey. (1983). Echague, Philippines. Bureau of Coast and Geodetic Survey.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Philippines. Bureau of Coast and Geodetic Survey. Echague, Philippines. Manila: Bureau of Coast and Geodetic Survey, 1983.

एमएलए (9वां संस्करण) प्रशस्ति पत्र

Philippines. Bureau of Coast and Geodetic Survey. Echague, Philippines. Bureau of Coast and Geodetic Survey, 1983.