Loyola, J. A. (1997). Petron reports 13% profit growth. Manila Bulletin.
芝加哥风格引文Loyola, James A. "Petron Reports 13% Profit Growth." Manila Bulletin 1997.
MLA引文Loyola, James A. "Petron Reports 13% Profit Growth." Manila Bulletin, 1997.
警告：这些引文格式不一定是100％准确.