Lucas, D. L. (2023). Roberto Ongpin: Technocrat, tycoon; 86. Philippine Daily Inquirer.
Cita Chicago (17th ed.)Lucas, Daxim L. "Roberto Ongpin: Technocrat, Tycoon; 86." Philippine Daily Inquirer 2023.
Cita MLA (9th ed.)Lucas, Daxim L. "Roberto Ongpin: Technocrat, Tycoon; 86." Philippine Daily Inquirer, 2023.
Atenció: Aquestes cites poden no estar 100% correctes.