Cite the scanned version of the original dicionary like this:
Toller, T. Northcote, and Joseph Bosworth. "gang." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth : Supplement. Oxford: Clarendon Press, 1921. 765.
, geng, gong, gung, es; m.I. GANG, going, journey, step, way, path, passage, course (of time); ĭter, grădus, gressus, incessus, ambŭlātio, sēmĭta :-- Beswícan gangas [MS. M. stepas] míne supplantāre gressus meos, Ps. Spl. C. 139, 5. Mínne gang gressum meum, Ps. Th. 139, 5. Ganges, Beo. Th. 1940; B. 968. Him tǽcean lífes weg and rihtne gang to heofonum to teach them the way of life and the right path to heaven, Blickl. Homl. l09, 18. Ðíne gangas gressus tui, Ps. Th. 67, 23. Fóta gangas pedum gressus, 72, 1.