Παραπομπή σε μορφή APA (7η εκδ.)

Philippines. National Mapping and Resource Information Authority. (1990). Region I (Ed.1, November, 1989.). National Mapping and Resource Information Authority.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Philippines. National Mapping and Resource Information Authority. Region I. Ed.1, November, 1989. Makati City: National Mapping and Resource Information Authority, 1990.

Παραπομπή σε μορφή MLA (9th εκδ.)

Philippines. National Mapping and Resource Information Authority. Region I. Ed.1, November, 1989. National Mapping and Resource Information Authority, 1990.