Cite the scanned version of the original dicionary like this:
Toller, T. Northcote, and Joseph Bosworth. "flot-herge." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth : Supplement. Oxford: Clarendon Press, 1921. 227.
, es; m. A naval force; nāvālis exercĭtus :-- Hygelác cwom faran flotherge Hygelac came faring with a naval force, Beo. Th. 5822; B. 2915. v. here, herge an army.