Morallos, C. P. (2003). Watchman of our borders: A brief history of the centennial of the Philippine Bureau of Customs 1902-2002. Penpower News Agency.
Chicago-referens (17:e uppl.)Morallos, Chando P. Watchman of Our Borders: A Brief History of the Centennial of the Philippine Bureau of Customs 1902-2002. Manila: Penpower News Agency, 2003.
MLA-referens (9:e uppl.)Morallos, Chando P. Watchman of Our Borders: A Brief History of the Centennial of the Philippine Bureau of Customs 1902-2002. Penpower News Agency, 2003.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.