Philippines. Nayional Irrigation Administration. Upper Pampanga river project. s.n].
Chicagoスタイル(17版)引用形式Philippines. Nayional Irrigation Administration. Upper Pampanga River Project. [manila: s.n].
MLA(9版)引用形式Philippines. Nayional Irrigation Administration. Upper Pampanga River Project. s.n].
警告: この引用は必ずしも正確ではありません.