Philippines. Bureau of Customs. (2010). Rules and Regulations to implement CAO No.4 on Establishing an Enhanced Customs Transit System with the use of Global Positioning (GSP) Technology. Philippine Daily Inquirer.
Cita Chicago (17th ed.)Philippines. Bureau of Customs. "Rules and Regulations to Implement CAO No.4 on Establishing an Enhanced Customs Transit System with the Use of Global Positioning (GSP) Technology." Philippine Daily Inquirer 2010.
Cita MLA (9th ed.)Philippines. Bureau of Customs. "Rules and Regulations to Implement CAO No.4 on Establishing an Enhanced Customs Transit System with the Use of Global Positioning (GSP) Technology." Philippine Daily Inquirer, 2010.
Atenció: Aquestes cites poden no estar 100% correctes.