Artiaga, S. Engineering in the Philippines prior to the Spanish conquest. Unitas..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रArtiaga, Santiago. "Engineering in the Philippines Prior to the Spanish Conquest." Unitas. .
एमएलए (9वां संस्करण) प्रशस्ति पत्रArtiaga, Santiago. "Engineering in the Philippines Prior to the Spanish Conquest." Unitas., .
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