先端航空宇宙脅威特定計画
↑ Siese, April (2017年12月16日). “The Pentagon has confirmed its $22M program to investigate UFOs”. Quartz. https://qz.com/1158998/the-pentagon-confirms-its-22-million-ufo-investigation-program/ 2017年12月17日閲覧。
↑ Blumenthal, Ralph; Kean, Leslie (2020年5月14日). “Navy Reports Describe Encounters With Unexplained Flying Objects – While some of the encounters have been reported publicly before, the Navy records are an official accounting of the incidents, including descriptions from the pilots of what they saw.”. The New York Times. https://www.nytimes.com/2020/05/14/us/politics/navy-ufo-reports.html 2020年5月15日閲覧。
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↑ Kean, Leslie (2017年10月23日). “Fmr. Manager of DOD Aerospace Threat Program: "UFOs are Real"”. The Huffington Post. 2017年12月17日閲覧。
↑ “Inside Knowledge About Unidentified Aerial Phenomena Could Lead To World-Changing Technology”. Huffington Post (2017年10月10日). 2017年12月21日閲覧。
↑ Zak, Dan (2018年5月30日). “UFOs are suddenly a serious news story. You can thank the guy from Blink-182 for that”. The Washington Post. https://www.washingtonpost.com/lifestyle/style/ufos-are-suddenly-a-serious-news-story-you-can-thank-the-guy-from-blink-182-for-that/2018/05/30/8fce7100-441b-11e8-ad8f-27a8c409298b_story.html?noredirect=on 2018年6月3日閲覧。