Philippine Research Guide & Philippines Bureau of Customs. Philippine customs documentation and practices: Compiled by Philippine Research Guide. PRG.
Cita Chicago (17th ed.)Philippine Research Guide i Philippines Bureau of Customs. Philippine Customs Documentation and Practices: Compiled by Philippine Research Guide. Quezon City: PRG.
Cita MLA (9th ed.)Philippine Research Guide i Philippines Bureau of Customs. Philippine Customs Documentation and Practices: Compiled by Philippine Research Guide. PRG.
Atenció: Aquestes cites poden no estar 100% correctes.