Cite the scanned version of the original dicionary like this:
Toller, T. Northcote, and Joseph Bosworth. "hago-steald." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth : Supplement. Oxford: Clarendon Press, 1921. 501.
, es; m. One living in the lord's house, not having his own household, an unmarried person, a young person, young warrior :-- Hagosteald onwóc módig from moldan the young warrior [Christ] was roused exulting from earth, Exon. 120 a; Th. 460, 23; Hö. 21. Heafoc weorþeþ tó hagostealdes honda gelǽred the hawk becomes trained to the youth's hand, 88 b; Th. 332, 28; Vy. 92. [O. Sax. haga-stald, -stold a servant, young man : O. H. Ger. haga-stalt, -stolt mercenarius, cælebs : Ger. hagestolz old bachelor.] v. Grmm. R. A.