Kingdom of Butuan

Prakash p. 119–120. ^ Cembrano, Margarita R. Patterns of the Past: The Ethno Archaeology of Butuan.. http://www.oocities.com/Athens/Cyprus/8446/tara.html

d'Indonésie, Paris, De Boccard, 1948, p.337. ^ “The Kingdom of Butuan”. Philippine Gold: Treasures of Lost Kingdoms. Asia Society New York. 2019年3月8日閲覧。