Philippines. Mapping and Resource Information Authority. (1989). Region II: Cagayan Valley. National Mapping and Resource Information.
Chicagoスタイル(17版)引用形式Philippines. Mapping and Resource Information Authority. Region II: Cagayan Valley. Makati, Metro Manila: National Mapping and Resource Information, 1989.
MLA(9版)引用形式Philippines. Mapping and Resource Information Authority. Region II: Cagayan Valley. National Mapping and Resource Information, 1989.
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