Europa, P. R. (2002). Charter change initiative crosses political barriers. Manila Bulletin.
芝加哥风格引文Europa, Prudencio R. "Charter Change Initiative Crosses Political Barriers." Manila Bulletin 2002.
MLA引文Europa, Prudencio R. "Charter Change Initiative Crosses Political Barriers." Manila Bulletin, 2002.
警告：这些引文格式不一定是100％准确.