アメリカ合衆国国立公園局
↑ Laura B. Comay (19 May 2022). National Park Service: FY2022 Appropriations (Report). Congressional Research Service. p. 1. 2022年5月25日閲覧。
↑ “What We Do (U.S. National Park Service)” (英語). www.nps.gov. 2020年7月4日閲覧。
↑ "The National Park Service is a bureau of the U.S. Department of the Interior and is led by a Director nominated by the President and confirmed by the U.S. Senate." - a quote from https://www.nps.gov/aboutus/index.htm