Kim, Jaewoo, and Sangryul Shim. “A Case Study on the Evolutionary Development of U.S Unmanned Aerial Vehicles (UAVs): Focusing on Tactical/Strategic Fixed-Wing UAVs”. Journal of Advances in Military Studies 3, no. 2 (August 31, 2020): 17-46. Accessed December 4, 2020. https://journal.idap.re.kr/index.php/JAMS/article/view/69.