Jean Piaget, Danilo Cargnello , Jean Guilhot , Alex Comfort , Emanuel K. Schwartz , Ruth Leder , E. Amado Lévy-Valensi (1969) Le domaine humain / The human context: der Mensch und seine Welt / Hombre y sociedad / Il mondo vissuto dell"uomo, Dordrecht, Springer.
pp. 209-212
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