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Lua i Stíl Chicago (17ú heag.)Title. IBON Philippines Profile: Region 1: Ilocos Region. First ed. Manila: IBON Philippines Databank & Research Center, 1995.
Lua MLA (9ú heag.)Title. IBON Philippines Profile: Region 1: Ilocos Region. First ed. IBON Philippines Databank & Research Center, 1995.
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