Cite the scanned version of the original dicionary like this:
Toller, T. Northcote, and Joseph Bosworth. "háma." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth : Supplement. Oxford: Clarendon Press, 1921. 505.
, homa, an; m. A covering. [Prompt. Parv. hame thyn skynne of an eye, or other like: K. Alis. dragoun's hame (cf. Icel. hams a snake's slough): O. Sax. O. H. Ger. hamo in compounds: and cf. O. H. Ger. hemidi camisa, vestimentum.] v. ham. DER. byrn-, cild-, feðer-, flǽsc-, gold-, grǽg-, heort-, líc-, wuldor-hama.