Referencing is very important part of the whitepaper. All sources,references used to develop the white paper 1.0. For example : https://www.visualcapitalist.com/size-oil-market/ (you can see this link in our whitepaper 1.0). You can find more information in the future: We will announce Whitepaper 2.0 (2019 , April). You can learn a lot of information from the Whitepaper 2.0 after released. Well keep you updated as more details come in. Also,you can ask questions CEO in the Linkedin platform. Thank you for your patience and understanding !