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.
Lua i Stíl Chicago (17ú heag.)Demate, Cielo Jane M., agus 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.
Lua MLA (9ú heag.)Demate, Cielo Jane M., agus Virginia Yap. Determinants of the Sustainability of Duty Free Shops in Clark Freeport Zone. University of the Philippines Diliman Extension Program in Pampanga, 2010.
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