APA-viite (7. p.)

Philippines (Republic). National Power Corporation. (1972). Feasibility report on the Cagayan Valley electrification project. [s.n.].

Chicago-viite (17. p.)

Philippines (Republic). National Power Corporation. Feasibility Report on the Cagayan Valley Electrification Project. Manila: [s.n.], 1972.

MLA-viite (9. p.)

Philippines (Republic). National Power Corporation. Feasibility Report on the Cagayan Valley Electrification Project. [s.n.], 1972.