Gonzales, I. C. (2023). Billionaire, former trade minister Roberto Ongpin, 86. Philippine Star.
Cita Chicago (17th ed.)Gonzales, Iris Cecilia. "Billionaire, Former Trade Minister Roberto Ongpin, 86." Philippine Star 2023.
Cita MLA (9th ed.)Gonzales, Iris Cecilia. "Billionaire, Former Trade Minister Roberto Ongpin, 86." Philippine Star, 2023.
Atenció: Aquestes cites poden no estar 100% correctes.