^Boeing and United Air Lines from Birth to Break Up, 1919-1934 (HistoryLink.org Online Encyclopedia of Washington State History) [1]نسخة محفوظة 2016-06-18 في Wayback Machine
^Kenworth Motor Truck Corporation incorporates in Seattle in January 1923(HistoryLink.org Online Encyclopedia of Washington State History) [2]نسخة محفوظة 2016-05-18 في Wayback Machine
^Federal anti-trust actions cause United Aircraft and Transport, a Boeing conglomerate, to dissolve (HistoryLink.org Online Encyclopedia of Washington State History) [3]نسخة محفوظة 2016-06-18 في Wayback Machine
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