Mendoza, P. R. (2000). Half-full or half-empty? Philippine Graphic.
Cita Chicago (17th ed.)Mendoza, Psyche Roxas. "Half-full or Half-empty?" Philippine Graphic 2000.
Cita MLA (9th ed.)Mendoza, Psyche Roxas. "Half-full or Half-empty?" Philippine Graphic, 2000.
Atenció: Aquestes cites poden no estar 100% correctes.