1. ^{{cite web|url=https://www.popsci.com/chinese-hypersonic-engine-wins-award-reshapes-speed-race|title=Chinese Hypersonic Engine Wins Award, Reshapes Speed Race?|author=|date=|website=Popular Science|accessdate=17 December 2018}}
2. ^{{cite web|url=https://www.popsci.com/chinas-hybrid-spaceplane-could-reset-21st-century-space-race|title=China's Hybrid Spaceplane Could Reset The 21st Century Space Race|author=|date=|website=Popular Science|accessdate=17 December 2018}}
3. ^{{cite web|url=https://books.google.com/books?id=m0g4DwAAQBAJ&pg=PT83&lpg=PT83&dq=Shadow+Dragon+hypersonic&source=bl&ots=e_jXfV0_SH&sig=FCvk_9miYb-ie_ioWe8qh6_TEzc&hl=en&sa=X&ved=2ahUKEwjXk5qy0abfAhVrh4sKHYdiA3EQ6AEwD3oECAIQAQ|title=Asia’s Naval Expansion: An Arms Race in the Making?|first=Geoffrey|last=Till|date=3 October 2017|publisher=Routledge|accessdate=17 December 2018|via=Google Books}}
4. ^{{cite web|url=https://books.google.com/books?id=JrtKCAAAQBAJ&pg=PA105&lpg=PA105&dq=Shadow+Dragon+hypersonic&source=bl&ots=Pgehyr_lMN&sig=4EypRiu1lF39E1fbSvY1iZHeoBQ&hl=en&sa=X&ved=2ahUKEwjXk5qy0abfAhVrh4sKHYdiA3EQ6AEwE3oECAMQAQ|title=Strategic Reassurance and Resolve: U.S.-China Relations in the Twenty-First Century|first1=James|last1=Steinberg|first2=Michael E.|last2=O`Hanlon|date=25 August 2015|publisher=Princeton University Press|accessdate=17 December 2018|via=Google Books}}