Cite the scanned version of the original dicionary like this:
Toller, T. Northcote, and Joseph Bosworth. "acan." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth : Supplement. Oxford: Clarendon Press, 1921. 5.
; ic ace, ðú æcest, æcst, he æceþ, æcþ, pl. acaþ; p. óc, pl. ócon; subj. ic, ðú, he ace; pp. acen; v. n. To AKE, pain; dolere :-- Gif mannes midrif [MS. midrife] ace if a man's midriff ake, Herb. 3,6; Lchdm. i. 88, 11: Herb. Cont. 3, 6 ; Lchdm. i. 6; 3, 6. Acaþ míne eágan my eyes ake, Ælfc. Gr. 36, MS. D; [mistiaþ = acaþ, Som. 38, 48]; dolent mei oculi, Mann. [Laym. p. oc: R. Glouc. p. ok: Chauc, ake: N. L. Ger. aken, æken.]