Arao, D. A. (1999). How much does government earn from the oil companies? IBON Facts & Figures.
Chicago-referens (17:e uppl.)Arao, Danilo A. "How Much Does Government Earn from the Oil Companies?" IBON Facts & Figures 1999.
MLA-referens (9:e uppl.)Arao, Danilo A. "How Much Does Government Earn from the Oil Companies?" IBON Facts & Figures, 1999.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.