Philippines. National Mapping & Resource Information Authority. Laoag. National Mapping & Resource Information Authority, 1990.
Citazione stile Chigago Style (17a edizione)Philippines. National Mapping & Resource Information Authority. Laoag. Makati, Metro Manila: National Mapping & Resource Information Authority, 1990.
Citatione MLA (9a ed.)Philippines. National Mapping & Resource Information Authority. Laoag. National Mapping & Resource Information Authority, 1990.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.