Cite the scanned version of the original dicionary like this:
Toller, T. Northcote, and Joseph Bosworth. "yfel-ness." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth : Supplement. Oxford: Clarendon Press, 1921. 752.
, e; f. Evil, wickedness, badness :-- Yfelnys malignitas, Ælfc. Gr. 9, 25; Zup. 50, 10. I. in a moral sense :-- Micel yfelnys (malitia) manna wæs ofer eorðan, Gen. 6, 5. Hé (Antichrist) neádaþ þurh yfelnysse ðæt men sceolon búgan fram heora Scyppendes geleáfan tó his leásungum, se ðe is ord ǽlcre leásunge and yfelnysse . . . on ðam tíman bið micel yfelnyss and þwyrnys betwux mancynne, Homl. Th. i. 4, 27-33. Sume burgon heora feore and ámeldodon heora cristenan mágas . . .