Cite the scanned version of the original dicionary like this:
Toller, T. Northcote, and Joseph Bosworth. "sadian." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth : Supplement. Oxford: Clarendon Press, 1921. 692.
;p. ode. I.to satisfy, satiate. [O. H. Ger. satón saturare. Cf. Icel. seðja to satisfy.] v. ge-sadian. II.to become satisfied, to get satiated or tired :-- Mé þincþ ðæt ðú sadige hwæt hwegnunges and ðé þincen tó ǽlenge ðás langan spell methinks thou art getting somewhat wearied and these long discourses seem to thee too protracted, Bt. 39, 4; Fox 218, 5.