Cite the scanned version of the original dicionary like this:
Toller, T. Northcote, and Joseph Bosworth. "in-seglian." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth : Supplement. Oxford: Clarendon Press, 1921. 594.
;p. ode To seal, place a seal upon :-- Hig innseglodon ðone stán signantes lapidem, Mt. Kmbl. 27, 66. Inseglige man ða hand let a seal be put upon the hand, L. Æðelst. iv. 7; Th. i. 226, 30. [Icel. innsigla to seal : O. H. Ger. in-siglian signare.] v. ge-inseglian.