Cite the scanned version of the original dicionary like this:
Bosworth, Joseph. "bát." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth. Ed. Thomas Northcote Toller. Oxford: Clarendon Press, 1898. 69.
a boat. Dele: e, f., in first passage for Ðeós, l. Ðes, and add :-- Baat linter, Wrt. Voc. ii. 112, 81. Bát, i. 47, 62: 56, 10: barca, An. Ox. 5457: 4, 91. Þrié Scottas cómon on ánum báte bútan ǽlcum geréþrum . . . Se bát wæs geworht of þriddan healfre hýde, Chr. 891; P. 82, 18-22. Flota wæs on ýðum, bát under beorge, B. 211. On bátes fæðm, An. 444: Bo. 5. Báte lembulo, Germ. 399, 455: lintre, Wrt. Voc. ii. 76, 25: 52, 11. Lytle báte lintrum, 52, 12. Bát lintrem, 75, 9: 52, 24: lembum, naviculum, i.