Thinking and Speaking by Lev Vygotsky
Written: 1934 / Source: Thought and Language / Publisher: The M.I.T. Press, 1962 Translated: Edited and translated by Eugenia Hanfmann and Gertrude Vakar Transcribed: Andy Blunden;

Table of Contents:

Author's Preface
Chapter 1 - The Problem and the Approach
Chapter 2 - Piaget's Theory of Child Language and Thought
Chapter 3 - Stern's Theory of Language Development
Chapter 4 - The Genetic Roots of Thought and Speech
Chapter 5 - An Experimental Study of Concept Formation
Chapter 6 - The Development of Scientific Concepts in Childhood
         (excerpt) - Written, Inner and Oral Speech
Chapter 7 - Thought and Word

Each word is therefore already a generalisation. Generalisation is a verbal act of thought and reflects reality in quite another way than sensation and perception reflect it.