Haughton, E. (1997). Why are some periods worse than others? Manila Bulletin.
Chicago Style aipamenaHaughton, Emma. "Why Are Some Periods Worse than Others?" Manila Bulletin 1997.
MLA aipamenaHaughton, Emma. "Why Are Some Periods Worse than Others?" Manila Bulletin, 1997.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.