Haughton, E. (1997). Why are some periods worse than others? Manila Bulletin.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHaughton, Emma. "Why Are Some Periods Worse than Others?" Manila Bulletin 1997.
एमएलए (9वां संस्करण) प्रशस्ति पत्रHaughton, Emma. "Why Are Some Periods Worse than Others?" Manila Bulletin, 1997.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.