Olchondra, R. T. DOTC upgrades obsolete, risky MRT signaling system. IN Business. Philippine Daily Inquirer.
Citación estilo ChicagoOlchondra, Riza T. "DOTC Upgrades Obsolete, Risky MRT Signaling System. IN Business." Philippine Daily Inquirer .
Cita MLAOlchondra, Riza T. "DOTC Upgrades Obsolete, Risky MRT Signaling System. IN Business." Philippine Daily Inquirer, .
Warning: These citations may not always be 100% accurate.