David, C. C. (2000). Changing patterns of agricultural protection and trade. Philippine institute for Development Studies/Bureau of Agricultural Research.
Παραπομπή σε μορφή Chicago (17η εκδ.)David, Cristina C. Changing Patterns of Agricultural Protection and Trade. Makati: Philippine institute for Development Studies/Bureau of Agricultural Research, 2000.
Παραπομπή σε μορφή MLA (9th εκδ.)David, Cristina C. Changing Patterns of Agricultural Protection and Trade. Philippine institute for Development Studies/Bureau of Agricultural Research, 2000.
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