↑ Winthrop, John (1844). Silliman, Benjamin (biên tập). “Art. V. Selections from an Ancient Catalogue of objects of Natural History, formed in New England more than one hundred years ago”. The Amer. J. Science and Arts 47. New Haven: Baldwin, Cradock, and Joy. tr. 282. Truy cập ngày 12 tháng 2 năm 2015. ... (p.282:) Mr. Winthrop was grandson of the first governor of Connecticut, great grandson of the first governor of Massachusetts... (p.290:) A black mineral... Is this the Columbite?... it appeared that it had been sent... to Sir Hans Sloane, by Mr. Winthrop of Massachusetts....'
↑ Griffith, William P.; Morris, Peter J.T. (22 tháng 9 năm 2003). “Charles Hatchett FRS (1765–1847), Chemist and Discoverer of Niobium” (PDF). The Annals of Philosophy. New Series. July to December 1824. London: The Royal Society Publishing. tr. 359. Truy cập ngày 12 tháng 2 năm 2015. ... In 1800–01, while he was arranging some minerals at the British Museum in Bloomsbury, he became particularly interested in a specimen which was described in Sir Hans Sloane’s catalogue of the ‘Metalls’, no. 2029 from his collection, as ‘a very heavy black stone with golden streaks... from Nautneague. From Mr. Winthrop’... The donor was probably John Winthrop (1681–1747), a great-grandson of the founder of Massachusetts Bay colony. When Winthrop was elected FRS in 1734 he gave Sir Hans Sloane, then President of the Society, a collection of about 600 minerals. ...'
↑ Jameson, Robert (1805). System of Mineralogy, Vol. II. Edinburgh: Bell and Bradfute (et al.). tr. 582. Truy cập ngày 15 tháng 2 năm 2015. ... Mr Hatchett found it to contain a metal, which, from its properties, could not be referred to any hitherto known; hence he was of opinion that it should be considered as a new genus, to which he gave the name Columbium, in honour of the discoverer of America. ...'
