APA (7th ed.) Citation

(1989). Ilocos region. National Mapping and Resource Information Authority.

Chicago Style (17th ed.) Citation

Ilocos Region. Manila: National Mapping and Resource Information Authority, 1989.

MLA (9th ed.) Citation

Ilocos Region. National Mapping and Resource Information Authority, 1989.

Warning: These citations may not always be 100% accurate.