Cite the scanned version of the original dicionary like this:
Toller, T. Northcote, and Joseph Bosworth. "ealdor." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth : Supplement. Oxford: Clarendon Press, 1921. 167.
, aldor, es, ; n: e; f?I.life; vita :-- Ealdres æt ende at life's end, Beo. Th. 5573; B. 2790. Ðe him wolde ealdres geunnan which would grant him life, Andr. Kmbl. 2263; An. 1133. On ðissum ealdre in this life, Ps. Th. 87, 14. Deáþ geþryðeþ ealdor ánra gehwæs death expels the life of every one, Exon. 62 b; Th. 231, 10; Ph. 487. Nalles for ealdre mearn he cared not for life, Beo. Th. 2889; B. 1442. He æt wíge gecrang ealdres scyldig he succumbed in battle, his life forfeiting, 2680; B. 1338: 4128; B. 2061.