Ehrhard, Thomas (July 2010). "Air Force UAVs: The Secret History"(PDF). Defense Technical Information Center (DTIC®). Mitchell Institute for Airpower Studies. Archived from the original on 18 May 2017. Retrieved 20 July 2015.
Leclerc du Sablon, Jean (29 December 1972). Baquet, Dean; Louttit, Meghan; Corbett, Philip; Chang, Lian; Drake, Monica; Kahn, Joseph; Kingsbury, Kathleen; Sulzberger, A.G.; Levien, Meredith Kopit; Caputo, Roland A.; Bardeen, William; Dunbar-Johnson, Stephen; Brayton, Diane (eds.). "Newsmen in Hanoi Visit Street of Ruins". Main section. The New York Times. Vol. CXXI, no. 261. New York City. France-Presse. p. A1. ISSN0362-4331. OCLC1645522. Retrieved 6 June 2021.
Ehrhard, Thomas (July 2010). "Air Force UAVs: The Secret History"(PDF). Defense Technical Information Center (DTIC®). Mitchell Institute for Airpower Studies. Archived from the original on 18 May 2017. Retrieved 20 July 2015.
Leclerc du Sablon, Jean (29 December 1972). Baquet, Dean; Louttit, Meghan; Corbett, Philip; Chang, Lian; Drake, Monica; Kahn, Joseph; Kingsbury, Kathleen; Sulzberger, A.G.; Levien, Meredith Kopit; Caputo, Roland A.; Bardeen, William; Dunbar-Johnson, Stephen; Brayton, Diane (eds.). "Newsmen in Hanoi Visit Street of Ruins". Main section. The New York Times. Vol. CXXI, no. 261. New York City. France-Presse. p. A1. ISSN0362-4331. OCLC1645522. Retrieved 6 June 2021.