Artiaga, S. Engineering in the Philippines prior to the Spanish conquest. Unitas..
Lua i Stíl Chicago (17ú heag.)Artiaga, Santiago. "Engineering in the Philippines Prior to the Spanish Conquest." Unitas. .
Lua MLA (9ú heag.)Artiaga, Santiago. "Engineering in the Philippines Prior to the Spanish Conquest." Unitas., .
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