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Kellett KD-1 Kellett XR-8 Kellett Autogiro Corporation Kellett XR-10 Kellerton, Iowa Kelle, Tuşba Keller, TexasTài liệu tham khảo
WikiPedia: Kellett XR-8 http://collections.nasm.si.edu/code/emuseum.asp?st... http://www.nasm.si.edu/collections/artifact.cfm?id... https://archive.org/details/airlifeshelicopt0000si... https://archive.org/details/airlifeshelicopt0000si... https://web.archive.org/web/20110402203817/http://...