Cite the scanned version of the original dicionary like this:
Bosworth, Joseph. "ofer-cídan." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth. Ed. Thomas Northcote Toller. Oxford: Clarendon Press, 1898. 731.
.Add :-- Hé sylf cídde (ofercídde, v. l.) and þreáde (vehementer increpavit) þæs muneces dysignysse, and þá swá gecíded (ofercíded, v. l.) hé wæs eft gecyrred tó his mynstre, Gr. D. 111, 16: 132, 23.