Cite the scanned version of the original dicionary like this:
Toller, T. Northcote, and Joseph Bosworth. "ge-þéwan." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth : Supplement. Oxford: Clarendon Press, 1921. 432.
;p. -þéwde; pp. -þéwed, -þéwd To oppress; opprĭmĕre :-- He sárig folc, geþéwde þurste, blissade he gladdened the sorrowful people, oppressed with thirst, Ps. Th. 106, 32. v. ge-þýwan.