1. Katyukha P., Trade in hydrocarbons on the global energy markets (2015) http://elib.gubkin.ru/content/21469
2. https://www.oxfordenergy.org/wpcms/wp-ontent/uploads/2011/03/WPM40-AnAnatomyoftheCrudeOilPricingSystem-BassamFattouh-2011.pdf
3. https://www.spglobal.com/platts/en
4. US Energy Information Administration
5. SPIMEX, www/spimex.ru