Borja, R. I. (1985). Soil incompressibility by 'mixed' and penalty methods. Philippine Engineering Journal.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBorja, Ronaldo I. "Soil Incompressibility by 'Mixed' and Penalty Methods." Philippine Engineering Journal 1985.
एमएलए (9वां संस्करण) प्रशस्ति पत्रBorja, Ronaldo I. "Soil Incompressibility by 'Mixed' and Penalty Methods." Philippine Engineering Journal, 1985.
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