Demate, C. J. M., & Yap, V. (2010). Determinants of the sustainability of duty free shops in clark freeport zone. University of the Philippines Diliman Extension Program in Pampanga.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Demate, Cielo Jane M., و Virginia Yap. Determinants of the Sustainability of Duty Free Shops in Clark Freeport Zone. Pampanga: University of the Philippines Diliman Extension Program in Pampanga, 2010.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Demate, Cielo Jane M., و Virginia Yap. Determinants of the Sustainability of Duty Free Shops in Clark Freeport Zone. University of the Philippines Diliman Extension Program in Pampanga, 2010.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.