Label: thin/thick/thin three-line tools

Graham Pollard (1975), “Some Anglo-Saxon Bookbindings”, The Book Collector, 24, pp. 130–59.

Christopher Clarkson (1996), “Further Studies in Anglos-Saxon and Norman Bookbinding: Board Attachment Methods Re-Examined”, in Roger Powell, the Compleat Binder: Liber Amicorum, edited by John L Sharpe, 14, Bibliologia, Turnhout, Brepols, pp. 154–214.