Philippines (Republic) Bureau of Lands. (1962). Philippine land surveyors manual. Certeza Surveying.
Cita Chicago Style (17a ed.)Philippines (Republic) Bureau of Lands. Philippine Land Surveyors Manual. Manila: Certeza Surveying, 1962.
Cita MLA (9a ed.)Philippines (Republic) Bureau of Lands. Philippine Land Surveyors Manual. Certeza Surveying, 1962.
Precaución: Estas citas no son 100% exactas.