Medalla, E. M., & Yap, J. T. (2008). Policy issues for the ASEAN Economic Community: The rules of origin. Philippine Institute for Development Studies.
Lua i Stíl Chicago (17ú heag.)Medalla, Erlinda M., agus Josef T. Yap. Policy Issues for the ASEAN Economic Community: The Rules of Origin. Makati City: Philippine Institute for Development Studies, 2008.
Lua MLA (9ú heag.)Medalla, Erlinda M., agus Josef T. Yap. Policy Issues for the ASEAN Economic Community: The Rules of Origin. Philippine Institute for Development Studies, 2008.
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