Gloria Cunanan Maphouse. (1989). Map of Northern Samar (1989 ed.). Gloria Cunanan Maphouse.
Lua i Stíl Chicago (17ú heag.)Gloria Cunanan Maphouse. Map of Northern Samar. 1989 ed. Makati, Metro Manila: Gloria Cunanan Maphouse, 1989.
Lua MLA (9ú heag.)Gloria Cunanan Maphouse. Map of Northern Samar. 1989 ed. Gloria Cunanan Maphouse, 1989.
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