Vallisuta, P. (1977). The Catbalogan series in Western Samar Island, Philippines [microform]. Photoduplication Service. University of the Philippines Library.
Chicago-referens (17:e uppl.)Vallisuta, Pong-Ake. The Catbalogan Series in Western Samar Island, Philippines [microform]. Quezon City: Photoduplication Service. University of the Philippines Library, 1977.
MLA-referens (9:e uppl.)Vallisuta, Pong-Ake. The Catbalogan Series in Western Samar Island, Philippines [microform]. Photoduplication Service. University of the Philippines Library, 1977.
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