Cite the scanned version of the original dicionary like this:
Toller, T. Northcote, and Joseph Bosworth. "gange-wifre." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth : Supplement. Oxford: Clarendon Press, 1921. 282.
, -wæfre, geonge-wifre, gonge-wifre, gongel-wæfre, an; f. A ganging weaver, spider; viītĭca arānea :-- Ðú gedést ðæt he aswint on his móde, and wyrþ swá tedre swá swá gangewifran nett thou causest that he dwindles away in his mind, and becomes as frail as a spider's web, Ps. Th. 38, 12. Swindan ðú dydest swá swá gangewæfre [áttercoppan MS. T.] sáwle his tabescĕre fēcisti sīcut arāneam anĭmam ejus, Ps. Spl. 38, 15.