Flavell, J. H. (1977). Cognitive development. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Flavell, John H. Cognitive Development. Englewood Cliffs, N.J.: Prentice-Hall, 1977.
Lua MLA (8ú heag.)Flavell, John H. Cognitive Development. Prentice-Hall, 1977.
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