Cite the scanned version of the original dicionary like this:
Toller, T. Northcote, and Joseph Bosworth. "ládung." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth : Supplement. Oxford: Clarendon Press, 1921. 599.
, e; f.I.An excusing, a clearing of or defending against a charge, an apology, excuse, a defence, exculpation :-- Ládung apologia, Ælfc. Gl. 106; Som. 78, 64; Wrt. Voc. 57, 43: excussatio, Wrt. Voc. ii. 146, 15.