Cite the scanned version of the original dicionary like this:
Bosworth, Joseph. "flége." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth. Ed. Thomas Northcote Toller. Oxford: Clarendon Press, 1898. 291.
, floege a ship :-- Floege ł lyttel scipp óeth;er ne uæs ðér nauicula alia non erat ibi, Jn. L. R. 6, 22. [From Scandinavian (?), Cf. Icel. fley a ship.]