The Collaborative International Dictionary of English v.0.48:

Autobiographic \Au`to*bi`o*graph"ic\, Autobiographical
\Au`to*bi`o*graph"ic*al\, a.
   Pertaining to, or containing, autobiography; as, an
   autobiographical sketch. "Such traits of the autobiographic
   sort." --Carlyle. -- Au`to*bi`o*graph"ic*al*ly, adv.
   [1913 Webster]