Cite the scanned version of the original dicionary like this:
Toller, T. Northcote, and Joseph Bosworth. "deófol-cræft." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth : Supplement. Oxford: Clarendon Press, 1921. 149.
, es; m. Devil-craft, the black art, witchcraft; dæmoniăca ars :-- Þurh dígolnesse deófolcræftes per dæmoniacæ artis arcāna, Bd. 4, 27; S. 604, 9. Hí nalæs mid deófolcræfte ac mid godcunde mægene gewélgade cóman illi non dæmoniaca sed divīna virtūte prædĭti veniēbant, Bd. 1, 25; S. 487, 1.