Cite the scanned version of the original dicionary like this:
Toller, T. Northcote, and Joseph Bosworth. "canonic." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth : Supplement. Oxford: Clarendon Press, 1921. 116.
, es; m. A canon, prebendary; canonicus :-- Ðæt Godes þeówas, biscopas and abbodas, munecas and mynecena, canonicas and nunnan, to rihte gecyrran that God's servants, bishops and abbots, monks and mynchens, canons and nuns, turn to right, L. Eth. vi. 2; Th. i. 314, 17: vi. 4; Th. i. 316, 1: v. 7; Th. i. 306, 13.