Cite the scanned version of the original dicionary like this:
Bosworth, Joseph. "earfoþ-fere." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth. Ed. Thomas Northcote Toller. Oxford: Clarendon Press, 1898. 233.
.l. -fére hard to travel, and for 'Scint. 10' substitute :-- Sume cumað swíðe feorran and habbað swíðe yfelne weig and swíðe earfoðférne, Shrn. 187, 12. Cf. eáþ-fére.