Cite the scanned version of the original dicionary like this:
Toller, T. Northcote, and Joseph Bosworth. "deáþ-scyldig." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth : Supplement. Oxford: Clarendon Press, 1921. 147.
;adj. [deáþ death, scyldig guilty] Death-guilty, condemned; damnātus :-- Gif deáþscyldig man scriftspræce gyrne if a man guilty of death desire confession, L. E. G. 5; Th. i. 168, 24: L. C. S. 44; Th. i. 402, 3.