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Peter Kitson, 'Lapidary traditions in Anglo-Saxon England: part I, the background; the Old English Lapidary' in: Anglo-Saxon England, vol. 7, eds. Martin Biddle, Julian Brown, Peter Clemoes, Cambridge University Press, 2007, ISBN978-0-521-03864-5, 9-60.
Joan Evans and Mary Sidney Serjeantsen (eds.), English Mediaeval Lapidaries, Early English Text Society Original Series 190, 1933 (reprinted 1999), ISBN0-85991-925-0.
Robert Max Garrett, Precious stones in old English literature (1909)