The Collected Works of L. S. Vygotsky. Volume 1: Problems of General Psychology. Including the Volume Thinking and Speechby L. S. Vygotsky; Robert W. Rieber; Aaron S. Carton; Norris Minick;The Collected Works of L. S. Vygotsky. Volume 2: The Fundamentals of Defectology (Abnormal Psychology and Learning Disabilities)by L. S. Vygotsky; Robert W. Rieber; Aaron S. Carton; Jane E. Knox; Carol B. Stevens;Understanding Vygotsky: A Quest for Synthesisby Rene van der Veer; Jaan Valsiner