Cite the scanned version of the original dicionary like this:
Bosworth, Joseph. "enge." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth. Ed. Thomas Northcote Toller. Oxford: Clarendon Press, 1898. 251.
.Add:I.narrow, confined :-- Þes ænga stede (hell), Gen. 356. Se Hǽlend mé in þám engan hám getýnde, El. 921. II.painful, grievous, cruel :-- Se enga deáð mors crudelis, Ph. 52. Under enge treówe sub ipso stipite, Germ. 395, 24. Nearusorge dreáh, enge rúne, El. 1262.