Cite the scanned version of the original dicionary like this:
Toller, T. Northcote, and Joseph Bosworth. "gafol-heord." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth : Supplement. Oxford: Clarendon Press, 1921. 279.
, e; f. [gafol a tax, heord a herd, flock] A taxable stock or hive of bees; grex ad censum :-- Beóceorle gebýreþ, gif he gafolheorde healt, ðæt he sylle ðonne lande gerǽd beo. Mid us is gerǽd ðæt he sylle v sustras huniges to gafole it behoves a keeper of bees, if he hold a taxable hive [stock of bees], that he then shall pay what shall be ordered in the country.