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^ Unger 2019, pp. 100–101.

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^ Chernow 2010, pp. 6–10; Ferling 1988, pp. 4–5.

^ Chernow 2010, pp. 3–6.

^ Ferling 2002, p. 3; Chernow 2010, pp. 5–7.

^ Ferling 2009, p. 9; Chernow 2010, pp. 6–8.

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^ Chernow 2010, pp. 10–12; Ferling 2002, p. 14; Ferling 2010, pp. 5–6.

^ Ferling 1988, pp. 57–58.

^ Chernow 2010, pp. 10, 19; Ferling 2002, pp. 14–15; Randall 1997, p. 36.

