Mendoza, P. R. (2000). Half-full or half-empty? Philippine Graphic.
Chicago Style aipamenaMendoza, Psyche Roxas. "Half-full or Half-empty?" Philippine Graphic 2000.
MLA aipamenaMendoza, Psyche Roxas. "Half-full or Half-empty?" Philippine Graphic, 2000.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.