9780805810141 | Psychology Pr, March 1, 1993, cover price $100.00 | About this edition: The surge of contemporary interest in Vygotsky's contribution to child psychology has focused largely on his developmental method and his claim that higher psychological functions in the individual emerge out of social processes, that is, his notion of the "zone of proximal development.

9780306424427 | Revised edition (Plenum Pub Corp, January 31, 1993), cover price $299.00