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.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)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.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)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.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.