Cite the scanned version of the original dicionary like this:
Bosworth, Joseph. "gagol-bǽrnes." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth. Ed. Thomas Northcote Toller. Oxford: Clarendon Press, 1898. 359.
.Add :-- Gagolbǽrnesse lascivia, Wrt. Voc. ii. 49, 70. Sé ðe eall his mód bið áflogen tó gæglbǽrnesse qui totis cogitationibus ad lasciviam defluens, Past. 73, 11.