Philippines. Bureau of Customs & Philippine Researcg Guide. Customs regulations and rulings. PRG.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPhilippines. Bureau of Customs और Philippine Researcg Guide. Customs Regulations and Rulings. Quezon City: PRG.
एमएलए (9वां संस्करण) प्रशस्ति पत्रPhilippines. Bureau of Customs और Philippine Researcg Guide. Customs Regulations and Rulings. PRG.
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