1. Debt: The First Five Thousand Years;Graeber,2011
2. Global Cryptocurrency Benchmarking Study;Hileman;Camb. Cent. Altern. Financ.,2017
3. Cryptocurrencies: A Brief Thematic Review. SSRN 3024330 2017https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3024330
4. Market Capitalizationwww.coinmarketcap.com
5. The Market for Cryptocurrencies