Philippines (Republic). National Power Corporation. (1972). Feasibility report on the Cagayan Valley electrification project. [s.n.].
芝加哥风格引文Philippines (Republic). National Power Corporation. Feasibility Report on the Cagayan Valley Electrification Project. Manila: [s.n.], 1972.
MLA引文Philippines (Republic). National Power Corporation. Feasibility Report on the Cagayan Valley Electrification Project. [s.n.], 1972.
警告：这些引文格式不一定是100％准确.