グラント・ゲイル
↑ “Grinnell: Longtime physics professor dies”, Iowa City News Journal, (April 16, 1998), http://nl.newsbank.com/nl-search/we/Archives?p_action=doc&p_docid=0EAFE95EE7A9D6E9 .
↑ About the Grant O. Gale Observatory Archived 2013-02-17 at the Wayback Machine., Grinnell College, retrieved 2013-02-26.
↑ Transcript from Voices of the Past: Grant Gale, Drake Community Library, Grinnell, Iowa.
↑ Physics Historical Museum, Grinnell College
↑ page 94, Richard Tedlow, Andy Grove: The Life and Times of an American Business Icon, Penguin, 2007.
↑ Wolfe, Tom (1983年12月). “The Tinkerings of Robert Noyce”. Esquire Magazine. 2009年2月27日時点のオリジナルよりアーカイブ。2010年5月7日閲覧。