[Full Definition of the Stages, p. 2]
Huitt, W., & Hummel, J. (2003). Piaget's theory of cognitive development. Educational psychology interactive, 3(2), 1-5.
https://elearning.univ-mila.dz/a-2023/pluginfile.php/93247/mod_resource/content/1/Piagets Theory of Cognitive Development.pdf
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Note: Originally published in French as La Psychologie de l'intelligence (1947). The 1950 English translation is the widely cited hallmark edition.
Piaget, J. (1950). *The psychology of intelligence*. Routledge & Kegan Paul.
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