Source : Webster's Revised Unabridged Dictionary (1913)

Attributable \At*trib"u*ta*ble\, a.
   Capable of being attributed; ascribable; imputable.

         Errors . . . attributable to carelessness. --J. D.
                                                  Hooker.

Source : WordNet®

attributable
     adj : capable of being attributed; "the collapse of the movement
           was attributable to a lack of morale"; "an idea
           attributable to a Russian" [ant: {unattributable}]