Arcilla, Jose S, ed. (1990) Jesuit missionary letters from Mindanao. Publications of the Archives of the Philippine Province of the Society of Jesus (ser. 1). Philippine Province Archives, Quezon City, Philippines.
Eleazar, Eulogio V (1990) Notes on Surigao Culture and Personalities. New Day Publishers.
Pauly, D and Small, M and Vore, R and Palomares, M.L.D. (1990) Fisheries yields and morphoedaphic index of Lake Mainit, Philippines. In: The Second Asian Fisheries Forum, 1990, Manila, Philippines.
Surigao (Philippines). National Census and Statistics Office.} a (1990) Marriage contracts, 1946-1959. Filmed by the Genealogical Society of Utah, Salt Lake City, Utah.
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