1. Bitcoin: A Peer-to-Peer Electronic Cash Systemhttps://bitcoin.org/bitcoin.pdf
2. Bitcoin Hits a New Record High, But Stops Short of USD 20,000http://fortune.com/2017/12/17/bitcoin-record-high-short-of-20000/
3. Top 100 Cryptocurrencies by Market Capitalizationhttps://coinmarketcap.com/
4. Smart Cities Cybersecurity and Privacy;Rawat,2018