Cite the scanned version of the original dicionary like this:
Bosworth, Joseph. "-sagol." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth. Ed. Thomas Northcote Toller. Oxford: Clarendon Press, 1898. 813.
.Add :-- Litel ságul paxillus, Wrt. Voc. i. 26, 45. His óðer fót wearð fæst on ánum ságle (sáhle, v. l.) þæs geardes pes in sude sepis inhaesit, Gr. D. 26, 27. v. hege-ságol.