Cite the scanned version of the original dicionary like this:
Bosworth, Joseph. "cǽg-hyrde." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth. Ed. Thomas Northcote Toller. Oxford: Clarendon Press, 1898. 143.
.l. -hirde, and add :-- Caeghiorde clavicularius, Wrt. Voc. ii. 104, 21. [Ðe heuenliche keiherde Sainte Peter, O. E. Hml. ii. 193, 16. Cf. N. E. D. key-keeper.] Cf. cǽg-bora.