1. Gross R.J. Complete evolution & history of drones: From 1800s to 2022 December 31 2021 Retrieved April 10 2022 fromhttps://www.propelrc.com/history-of-drones/.
2. Balasubramaniam S. Drones may become ‘The next big thing’ in healthcare delivery. January 9 2022. Retrieved April 16 2022 fromhttps://www.forbes.com/sites/saibala/2022/01/09/drones-may-become-the-next-big-thing-in-healthcare-delivery/?cv=1&sh=7a5d3a681e9b.
3. Andreas Introduction to drones ‐ drone guide for dummies! AirBuzz.One Drone Blog September 2 2018 Retrieved April 10 2022 fromhttps://air-buzz.one/introduction-to-drones/.
4. A Comparative Analysis of the Environmental Benefits of Drone-Based Delivery Services in Urban and Rural Areas
5. Mario The history of drones (timeline from 1907 to 2021) Drone Tech Planet 2018 Retrieved April 10 2022 from https://www.dronetechplanet.com/the-history-of-drones-timeline-from-1907-to-2019/.