Cite the scanned version of the original dicionary like this:
Bosworth, Joseph. "ǽ-gewrítere." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth. Ed. Thomas Northcote Toller. Oxford: Clarendon Press, 1898. 12.
. In Kent. Gl. 245 'legum conditores' is rendered by a word which Zupitza reads as scepttenras. This in Junius' copy of the MS. is given by ægewriteras. The scept is uncertain, and Zupitza gives egewritteras as a more possible reading than that of Junius.