Pan, I. L. (1997). Napocor creates spot market for excess power. Manila Times.
Chicago Style aipamenaPan, Isabel L. "Napocor Creates Spot Market for Excess Power." Manila Times 1997.
MLA aipamenaPan, Isabel L. "Napocor Creates Spot Market for Excess Power." Manila Times, 1997.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.