APA (7th ed.) Citation

Philippines. Bureau of Coast and Geodetic Survey. (1940). Northern Luzon, Philippine Islands: Northern sheet. Bureau of Coast and Geodetic Survey.

Chicago Style (17th ed.) Citation

Philippines. Bureau of Coast and Geodetic Survey. Northern Luzon, Philippine Islands: Northern Sheet. Manila: Bureau of Coast and Geodetic Survey, 1940.

MLA (9th ed.) Citation

Philippines. Bureau of Coast and Geodetic Survey. Northern Luzon, Philippine Islands: Northern Sheet. Bureau of Coast and Geodetic Survey, 1940.