Colina, A. L. I. (2020). DPWH to build PH's first long-distance mountain tunnel in Davao. Manila Bulletin.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रColina, Antonio L. IV. "DPWH to Build PH's First Long-distance Mountain Tunnel in Davao." Manila Bulletin 2020.
एमएलए (9वां संस्करण) प्रशस्ति पत्रColina, Antonio L. IV. "DPWH to Build PH's First Long-distance Mountain Tunnel in Davao." Manila Bulletin, 2020.
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