Cite the scanned version of the original dicionary like this:
Toller, T. Northcote, and Joseph Bosworth. "mán-deorf." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth : Supplement. Oxford: Clarendon Press, 1921. 63.
;adj. Labouring to do evil, wicked :-- Ne mæg se yfela preóst mid his yfelnysse, ðeáh hé mándeorf sý and mánful on dǽdum, ne mæg hé nǽfre Godes þénunge gefílan, náðer ne ðæt fulluht, ne ða mæssan, L. Ælfc. P. 41; Th. ii. 382, 12. v. deorfan.