Cite the scanned version of the original dicionary like this:
Toller, T. Northcote, and Joseph Bosworth. "in-sting." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth : Supplement. Oxford: Clarendon Press, 1921. 594.
, es; m. Authority :-- Nán ðere biscope ne habbe nán insting on ðæt mynster let no bishop have any authority in that monastery, Chart. Th. 348, 12. v. on-sting.