Lua APA (7ú heag.)

Villanueva, M. A. (1997). Guingona sworn in as PACC chairman. Philippine Star.

Lua i Stíl Chicago (17ú heag.)

Villanueva, Marichu A. "Guingona Sworn in as PACC Chairman." Philippine Star 1997.

Lua MLA (9ú heag.)

Villanueva, Marichu A. "Guingona Sworn in as PACC Chairman." Philippine Star, 1997.

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