Cite the scanned version of the original dicionary like this:
Toller, T. Northcote, and Joseph Bosworth. "bán." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth : Supplement. Oxford: Clarendon Press, 1921. 757.
, baan, es; pl. bán; n. A BONE; os :-- Ðis ys nú bán of mínum bánum hoc nunc os ex ossibus meis, Gen. 2, 23. Moises nam Iosepes bán mid, him tulit Moyses ossa Ioseph secum, Ex. 13, 19: Cd. 9; Th. 12, 9; Gen. 182. Híg synt innan fulle deádra bána intus plena sunt ossibus mortuorum, Mt. Bos. 23, 27. Bán míne my bones, Ps. Spl. 6, 2: Exon. 110a; Th. 421, 14; Rä. 40, 18: 125b; Rä. 68, 3: Beo. Th. 5149; B. 2578. [Plat. been, n. os, crus: O. Sax. O. Frs. bén, n: Dut. been, n: Ger. M. H. Ger. bein, n: O. H.