Philippines. Bureau of Customs & Philippine Researcg Guide. Customs regulations and rulings. PRG.
Citazione stile Chigago Style (17a edizione)Philippines. Bureau of Customs e Philippine Researcg Guide. Customs Regulations and Rulings. Quezon City: PRG.
Citatione MLA (9a ed.)Philippines. Bureau of Customs e Philippine Researcg Guide. Customs Regulations and Rulings. PRG.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.