Prices. (2007). Unprecedented price of crude alerts oil firms. Manila Times.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPrices. "Unprecedented Price of Crude Alerts Oil Firms." Manila Times 2007.
एमएलए (9वां संस्करण) प्रशस्ति पत्रPrices. "Unprecedented Price of Crude Alerts Oil Firms." Manila Times, 2007.
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