Cite the scanned version of the original dicionary like this:
Bosworth, Joseph. "hǽþ-cole." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth. Ed. Thomas Northcote Toller. Oxford: Clarendon Press, 1898. 502.
.Substitute: haeþ-cole a plain-name :-- Haelcolae colomata, Wrt. Voc. ii. 105, 16. Hǽícole colomate, 15, 20. Hǽþcole stena, i. 68, 68 (in a list of plant-names).