Cite the scanned version of the original dicionary like this:
Toller, T. Northcote, and Joseph Bosworth. "mann-fultum." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth : Supplement. Oxford: Clarendon Press, 1921. 632.
, es; m. Military force, troops :-- Hié ǽr tweóde hwæðer hiene mon mid ǽnige monfultume gefliéman mehte they before doubted whether he (Hannibal) could be routed by any troops, Ors. 4, 9; Swt. 192, 16: 5, 7; Swt. 230, 9. Hié gegaderodon máran monfultum ðonne Philippus hæfde they got together a greater force than Philip had, 3, 7; Swt. 118, 16.