1. Nalty BC (ed) (1997) Winged shield, winged sword: a history of the USAF. Air Force History and Museums Program, United States Air Force, Washington, DC
2. Fahlstrom P, Gleason T, Introduction to UAV systems, 4th edn, p 287
3. 3 reasons why China is the global drones leader. https://www.weforum.org/agenda/2018/09/china-drones-technology-leader/
4. The Drone Market 2019–2024: 5 things you need to know. https://www.droneii.com/the-drone-market-2019-2024-5-things-you-need-to-know
5. The drone market. https://www.commercialuavnews.com/infrastructure/teal-group-analyzes-and-predicts-drone-market