Private Development Corporation of the Philippines. (1969). The electric power industry. s.n.].
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPrivate Development Corporation of the Philippines. The Electric Power Industry. [Makati: s.n.], 1969.
एमएलए (9वां संस्करण) प्रशस्ति पत्रPrivate Development Corporation of the Philippines. The Electric Power Industry. s.n.], 1969.
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