APA (7th ed.) Citation

Philippines. National Mapping & Resource Information Authority. Calayan Island. National mapping and Resource Information Authority, 1989.

Chicago Style (17th ed.) Citation

Philippines. National Mapping & Resource Information Authority. Calayan Island. Makati, Metro Manila: National mapping and Resource Information Authority, 1989.

MLA (9th ed.) Citation

Philippines. National Mapping & Resource Information Authority. Calayan Island. National mapping and Resource Information Authority, 1989.

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