Calica, A. (2010). Poll: Noynoy maintains 15-16% lead over Erap. Philippine Star.
Chicago Style aipamenaCalica, Aurea. "Poll: Noynoy Maintains 15-16% Lead over Erap." Philippine Star 2010.
MLA aipamenaCalica, Aurea. "Poll: Noynoy Maintains 15-16% Lead over Erap." Philippine Star, 2010.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.