Cite the scanned version of the original dicionary like this:
Toller, T. Northcote, and Joseph Bosworth. "æ." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth : Supplement. Oxford: Clarendon Press, 1921. 9.
;indecl. f. A river, stream; rivus, torrens :-- On ðære ǽ ðú hý drencst thou shalt give them to drink of the stream; torrente potabis eos, Ps. Th. 35, 8. v. eá.
;indecl. f. Law, statute, custom, rite, marriage; lex, statutum, ceremoniæ, ritus, matrimonium :-- God him sette ǽ ðæt ys open lagu God gave them a statute that is a plain law, Ælfc. T. 10, 20. Ǽ Drihtnes the law of the Lord, Ps. Spl. 18, 8: Mt. Bos. 26, 28. God is wísdóm and ǽ woruldbúendra God is the wisdom and law of the inhabitants of the world, Bt. Met. Fox 29, 165; Met. 29, 83. Cristes ǽ the Gospel. Bútan ǽ oððe útlaga an outlaw, Ælfc. Gr. 47; Som. 48, 44. Seó æftere ǽ Deuteronomy, Bd. 1, 27.
. The short or unaccented Anglo-Saxon æ has a sound like ai in main and fairy, as appears from these cognate words :-- Wæl wail, brædan to braid, nægel a nail, dæg, spær, læt, snæce, mæst, æsp, bær, etc.2. The short or unaccented æ stands only (1) before a single consonant; as Stæf, hwæl, dæg: (2) a single consonant followed by e in nouns; Stæfes, stæfe, hwæles, dæges, wæter, fæder, æcer: (3) or before st, sc, fn, ft; Gæst, æsc, hræfn, cræft: (4) before pp, bb, tt, cc, ss; Æppel, cræbba, hæbbe