Cite the scanned version of the original dicionary like this:
Toller, T. Northcote, and Joseph Bosworth. "ceaster-waru." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth : Supplement. Oxford: Clarendon Press, 1921. 12.
, e; f. Townsmen as a body, the citizens or city; cives, civitas :-- Ðá eóde eall seó ceaster-warú then the whole city [citizens as a body] came out, Mt. Bos. 8, 34.