Estupigan, R. (1999). What's your driving attitude? Manila Bulletin.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रEstupigan, Ruth. "What's Your Driving Attitude?" Manila Bulletin 1999.
एमएलए (9वां संस्करण) प्रशस्ति पत्रEstupigan, Ruth. "What's Your Driving Attitude?" Manila Bulletin, 1999.
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