Cite the scanned version of the original dicionary like this:
Toller, T. Northcote, and Joseph Bosworth. "deád-licnys." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth : Supplement. Oxford: Clarendon Press, 1921. 146.
, -nyss, e; f. Deadliness, mortality; mortalĭtas :-- Ðæt he dǽlnimend wǽre úre deádlícnysse that he was a partaker of our mortality, Homl. Th. i. 36, 34. He becom on ða tíde ðære mydan deádlícnysse tempŏre mortalitātis adveniens, Bd. 3, 23; S. 555, 9: 3. 30; S. 561, 38. Ealle his geféran on ðære deádlícnysse ðæs wæles of worulde genumene wǽron omnes sŏcii ipsōrum mortalitāte [cædis] de sæcŭlo rapti, 3, 27; S. 558, 36. He hæfde ealle deádlícnyssa aworpen he had cast off all mortalities, Homl. Th. ii. 290, 1. DER. un-deádlícnys.