Cite the scanned version of the original dicionary like this:
Toller, T. Northcote, and Joseph Bosworth. "gát." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth : Supplement. Oxford: Clarendon Press, 1921. 765.
, es; pl. nom. acc. u, a, o; n. A GATE; porta :-- Ðá se Hǽlend geneálǽhte ðære ceastre gate when the Saviour approached the gate of the city, Lk. Bos. 7, 12 : Exon. 12 b; Th, 20, 15; Cri. 318 : Ps. Spl. 117, 19 : Ps. Th. 126, 6. v. geat.
;nom. acc; gen. gáte, gǽte; dat. gǽt; pl. nom. acc. gǽt, gét; gen. gáta; dat. gátum; f. A she-GOAT; capra :-- Ic blǽte swá gát I bleat as a goat. Exon. 106 b; Th. 406, 17; Rä. 25, 2. Gát capra vel capella, Wrt. Voc. 78, 33 : 287, 36 : 288, 16. Gáte blód goat's blood, Med. ex Quadr. 6, 4; Lchdm. i. 352, 3. Gáte flǽsc goat's flesh, L. M. 1, 31; Lchdm. ii. 72, 8. Gáte horn a goat's horn, Med. ex Quadr. 6, 1; Lchdm. i. 350, 17. Gǽte meolc goat's milk, L. M. 1, 7; Lchdm. ii. 52, 13.