«Aparna», Encyclopædia Iranica. Sitat: «(Gk. Aparnoi/Parnoi, Lat. Aparni or Parni), an east Iranian tribe established on the Ochos (modern Taǰen, Teǰend) and one of the three tribes in the confederation of the Dahae...»
Medvedskaya, I. (20. juli 2004): «Phraortes», Encyclopædia Iranica.