Source : Webster's Revised Unabridged Dictionary (1913)

Referable \Ref"er*a*ble\ (r?f"?r*?*b'l), a.
   Capable of being referred, or considered in relation to
   something else; assignable; ascribable. [Written also
   {referrible}.]

         It is a question among philosophers, whether all the
         attractions which obtain between bodies are referable
         to one general cause.                    --W.
                                                  Nicholson.

Source : WordNet®

referable
     adj : (usually followed by `to') able to be assigned or credited
           to; "punctuation errors ascribable to careless
           proofreading"; "the cancellation of the concert was due
           to the rain"; "the oversight was not imputable to him";
           "decide to which of these motives such extraordinary
           scenes are referable"- Charles Dickens [syn: {ascribable(p)},
            {due to(p)}, {imputable(p)}, {referable(p)}]