Lua APA (7ú heag.)

Perez, D. (1999). Free trade & NSC. Manila Bulletin.

Lua i Stíl Chicago (17ú heag.)

Perez, Delfin. "Free Trade & NSC." Manila Bulletin 1999.

Lua MLA (9ú heag.)

Perez, Delfin. "Free Trade & NSC." Manila Bulletin, 1999.

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