RIEBER R. &. C. A. E., . (1987). COLLECTED WORKS OF L.S.VYGOTSKY VOL-I. : PLENUM PRESS,NEW YORK.
RIEBER ROBERT & CARTON AARON ED, . 1987. COLLECTED WORKS OF L.S.VYGOTSKY VOL-I. : PLENUM PRESS,NEW YORK.
RIEBER ROBERT & CARTON AARON ED, . COLLECTED WORKS OF L.S.VYGOTSKY VOL-I. : PLENUM PRESS,NEW YORK. 1987.