Cite the scanned version of the original dicionary like this:
Toller, T. Northcote, and Joseph Bosworth. "teóna." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth : Supplement. Oxford: Clarendon Press, 1921. 721.
, an; m.I.damage, harm, hurt, mischief, annoyance, trouble, vexation, detriment, loss :-- Mid ðý hunige smire . . . ne biþ sóna nán teóna smear with the honey . . . there will be no hurt (from the disease) directly, Lchdm. ii. 104, 23: 156, 30. Ðis weorc biþ deóflum se mǽsta teóna this work will prove the greatest vexation to devils, Blickl. Homl. 47, 6. Hit him wyrþ tó teónan it will turn to his hurt, 51, 9. Ne him wiht gescód ðæs ðe hý him tó teónan þurhtogen hæfdon, Exon. Th. 127, 36; Gú. 397: 269, 30; Jul. 458.