Domingo, Edwin G and Pabalan, Roberto T (1980) Geology of the Sianna and Alipao-Duyano areas, Mainit and Alegria, Surigao del Norte. Bureau of Mines and Geo-Sciences.
Tanaka, H. and Nakai, H. and Omoto, K. and Shibuya, T. and Hirai, M. and Mercado, A. S. and Pagaran, I. G. and Eviota, W. S. (1980) The high prevalence of Wuchereria bancrofti infections in indigenous tribes in northern Mindanao, Philippines. The Japanese Journal of Experimental Medicine, 50 (2). pp. 85-89.