Cite the scanned version of the original dicionary like this:
Bosworth, Joseph. "hálig-ern." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth. Ed. Thomas Northcote Toller. Oxford: Clarendon Press, 1898. 505.
.Add: -- Háligern archanum, Germ. 395, 42. Ðæt háliern wearð geopenod and þá lác wǽron in gebróhte, Ap. Th. 24, 6. On hálierne sacello, An. Ox. 3237. Oð ic ingá on háligern donec intrem in sanctuarium Dei, Ps. Rdr. 72, 17. Of háligetnum de sacrariis, Germ. 392, 43.