Cita APA (7a ed.)

Philippines. National Mapping and Resource Information Authority. Province of La Union (Ed. 1, July, 1990.). National Mapping and Resource Information Authority, 1990.

Cita Chicago Style (17a ed.)

Philippines. National Mapping and Resource Information Authority. Province of La Union. Ed. 1, July, 1990. Makati, Metro Manila: National Mapping and Resource Information Authority, 1990.

Cita MLA (9a ed.)

Philippines. National Mapping and Resource Information Authority. Province of La Union. Ed. 1, July, 1990. National Mapping and Resource Information Authority, 1990.