Colina, A. L. I. (2020). DPWH to build PH's first long-distance mountain tunnel in Davao. Manila Bulletin.
Cita Chicago (17th ed.)Colina, Antonio L. IV. "DPWH to Build PH's First Long-distance Mountain Tunnel in Davao." Manila Bulletin 2020.
Cita MLA (9th ed.)Colina, Antonio L. IV. "DPWH to Build PH's First Long-distance Mountain Tunnel in Davao." Manila Bulletin, 2020.
Atenció: Aquestes cites poden no estar 100% correctes.