Cite the scanned version of the original dicionary like this:
Toller, T. Northcote, and Joseph Bosworth. "gar." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth : Supplement. Oxford: Clarendon Press, 1921. 765.
, es; m. A dart, javelin, spear, shaft, arrow, weapon, arms; jacŭlum, pīlum, hasta, hastæ cuspis, săgitta, tēlum, arma :-- Se gár the dart, Beo. Th. 3697; B. 1846. Fleág giellende gár on grome þeóde the yelling shaft flew on the fierce nation, Exon. 86 b; Th. 326, 13; Wíd. 128. Lǽtaþ gáres ord, in gedúfan in fǽges ferþ let the javelin-point plunge into the life of the doomed one, Andr. Kmbl. 2662; An. 1332 : Cd. 75; Th. 92, 2; Gen. 1522. Sende se sǽrinc súþerne gár the sea-chief sent a southern dart, Byrht. Th. 135. 47; By. 134 : 138, 48; By. 237.