Philippines. National Mapping and Resource Information Authority. (1990). Region I (Ed.1, November, 1989.). National Mapping and Resource Information Authority.
Čikaški stil citiranja (17. izdanje)Philippines. National Mapping and Resource Information Authority. Region I. Ed.1, November, 1989. Makati City: National Mapping and Resource Information Authority, 1990.
MLA način citiranja (9. izdanje)Philippines. National Mapping and Resource Information Authority. Region I. Ed.1, November, 1989. National Mapping and Resource Information Authority, 1990.
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