Cite the scanned version of the original dicionary like this:
Toller, T. Northcote, and Joseph Bosworth. "ofer-gyldan." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth : Supplement. Oxford: Clarendon Press, 1921. 659.
to cover or ornament with gold :-- Ic ofergylde auro, Ælfc. Gr. 36 ; Som. 38, 39. Ealle ða græftas gé ofergyldaþ mid cræfte. Homl. Skt. i. 8, 61. On ofergildum hrægle in vestitu deaurato, Ps. Lamb. 44, 10: Homl. Th. ii. 586, 16. ii. sylure candelsticcan and ii. ouer*-*gylde, Cod. Dip. Kmbl. vi. 101, 26. Ða ofergyldan saglas sceolden stician on ðǽm gyldnum hringum. Past. 22; Swt. 171, 22.