(2010-05-19) Encyclopedia of the Peoples of Asia, p. 230. ISBN 9781438119137. “Archaeological work in the last decade has confirmed that a Georgian alphabet did exist very early in Georgia's history, with the first examples being dated from the fifth century C.E.”.
vehi.net
KorjunThe Life of Mashtots, translation into Russian and intro by Sh.V.Smbghaatyan and K.A.Melik-Oghajanyan, Moscow, 1962.