Cite the scanned version of the original dicionary like this:
Bosworth, Joseph. "ceder-treów." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth. Ed. Thomas Northcote Toller. Oxford: Clarendon Press, 1898. 149.
.Add :-- Neorxnawanges cedertreów, Gr. D. 191, 7. Cedertrýwes twyg, Angl. viii. 332, 37. Cedortreówu ... þá myclan cedertreówu cedros ... cedros Libani, Ps. Th. 28, 5.