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Sidgwick, J. B. William Herschel, explorer of the heavens, 1953.
LCCN 62-37909: Buttmann, G. Wilhelm Herschel, 1961 (hdg.: Herschel, William, Sir, 1738-1822; usage: Wilhelm Herschel)
Oxford DNB WWW site, Oct. 16, 2012 (Herschel, William; b. Nov. 15, 1738, Hanover; baptized Friedrich Wilhelm; d. Aug. 25, 1822, Slough; musician and astronomer)