Cite the scanned version of the original dicionary like this:
Toller, T. Northcote, and Joseph Bosworth. "hát-hirtan." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth : Supplement. Oxford: Clarendon Press, 1921. 51.
, -hiertan, -hyrtan; p. te To make angry :-- Ðonne is micel þearf ðætte se, se ða hátheortnesse ofercuman wille, ðæt hé hiene ongeán ne háthirte necesse est, ut hi, qui furentes conantur reprimere, nequaquam se in furore erigant, Past. 40, 5; Swt. 296, 6.