Villa, R. L. (1999). House approve 3 environment bills. Manila Bulletin.
芝加哥风格引文Villa, Rod L. "House Approve 3 Environment Bills." Manila Bulletin 1999.
MLA引文Villa, Rod L. "House Approve 3 Environment Bills." Manila Bulletin, 1999.
警告：这些引文格式不一定是100％准确.