グラント・ゲイル
↑ Berlin 2005, p. 22
↑ Berlin, Leslie (2005), The Man Behind the Microchip : Robert Noyce and the Invention of Silicon Valley, Oxford University Press, p. 22, ISBN 9780198036883, https://books.google.com/books?id=YLd3RBUrDlkC&pg=PA22 .
1 2 Berlin 2005, p. 24
↑ Berlin, Leslie (2005), The Man Behind the Microchip : Robert Noyce and the Invention of Silicon Valley, Oxford University Press, p. 22, ISBN 9780198036883, https://books.google.com/books?id=YLd3RBUrDlkC&pg=PA22 .
↑ Berlin 2005, p. 106
↑ Herbie Hancock '60 Archived 2012-09-05 at the Wayback Machine., Grinnell College, retrieved 2013-02-26.
↑ Alpha and Omega Sundial, Grinnell College