Calicia, A. M. and Lopez, N. A. (2000) The Biology and Fishery of Indigenous Gobies of Mainit Lake, Philippines. ACIAR proceedings. (98). p. 375.
Schreurs, P. (2000) Angry days in Mindanao: the Philippine revolution and the war against the U.S. in East and Northeast Mindanao, 1897-1908. Republic of the Philippines, National Commission for Culture and the Arts, National Historical Institute.
Schreurs, Peter (2000) Caraga Antigua, 1521-1910: the hispanization and christianization of Agusan, Surigao, and East Davao. Republic of the Philippines, National Commission for Culture and the Arts, National Historical Institute, Manila, Philippines.
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