APA (7. basım) Alıntı

National Power Corporation. 1979 statistical yearbook on the Philippine electric power industry. s.n.

Chicago Style (17. basım) Atıf

National Power Corporation. 1979 Statistical Yearbook on the Philippine Electric Power Industry. [s.l: s.n.

MLA (9th ed.) Atıf

National Power Corporation. 1979 Statistical Yearbook on the Philippine Electric Power Industry. s.n.