Gloria Cunanan Maphouse. (1989). Map of Northern Samar (1989 ed.). Gloria Cunanan Maphouse.
芝加哥风格引文Gloria Cunanan Maphouse. Map of Northern Samar. 1989 ed. Makati, Metro Manila: Gloria Cunanan Maphouse, 1989.
MLA引文Gloria Cunanan Maphouse. Map of Northern Samar. 1989 ed. Gloria Cunanan Maphouse, 1989.
警告：这些引文格式不一定是100％准确.