Arao, D. A. (1999). How much does government earn from the oil companies? IBON Facts & Figures.
芝加哥风格引文Arao, Danilo A. "How Much Does Government Earn from the Oil Companies?" IBON Facts & Figures 1999.
MLA引文Arao, Danilo A. "How Much Does Government Earn from the Oil Companies?" IBON Facts & Figures, 1999.
警告：这些引文格式不一定是100％准确.