Perez, D. (1999). Enerygy consumers wary of industry monopoly. Manila Bulletin.
芝加哥风格引文Perez, Delfin. "Enerygy Consumers Wary of Industry Monopoly." Manila Bulletin 1999.
MLA引文Perez, Delfin. "Enerygy Consumers Wary of Industry Monopoly." Manila Bulletin, 1999.
警告：这些引文格式不一定是100％准确.