(en) Sonia M. Zaide, The Philippines: A Unique Nation, All-Nations Publishing, 1999, (ISBN971-642-071-4), (ISBN978-971-642-071-5) : p. 62, 420, citant Fray Juan de Plasencia Customs of the Tagalogs publié à Nagcarlin en 1589 - [1] (en) Laura Lee Junker, Raiding, Trading, and Feasting: The Political Economy of Philippine Chiefdoms, Ateneo de Manila University Press, 2000, (ISBN971-550-347-0), (ISBN978-971-550-347-1) : p. 74 et 130.
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(en) Sonia M. Zaide, The Philippines: A Unique Nation, All-Nations Publishing, 1999, (ISBN971-642-071-4), (ISBN978-971-642-071-5) : p. 62, 420, citant Fray Juan de Plasencia Customs of the Tagalogs publié à Nagcarlin en 1589 - [1] (en) Laura Lee Junker, Raiding, Trading, and Feasting: The Political Economy of Philippine Chiefdoms, Ateneo de Manila University Press, 2000, (ISBN971-550-347-0), (ISBN978-971-550-347-1) : p. 74 et 130.