1. BP Statistical Review, June 2013 (bp.com/statisticalreview).
2. Peru: Law 288450 of 2013.
3. Brazil: Law 9.478 of 1997 (August 6).
4. Kojima, Masami, ‘Petroleum product pricing and complementary policies: Experience of 65 developing countries since 2009’, World Bank Policy research Working Paper 6396, Washington DC, April 2013.
5. Peru's downstream natural gas sector: a preliminary assessment;Benítez,2010