Sauvy, J., & Sauvy, S. (1974). The child's discovery of space. Penguin Educaction.
Chicago-čujuhus (17. p.)Sauvy, Jean, juo Simonne Sauvy. The Child's Discovery of Space. Harmondsworth, Eng.: Penguin Educaction, 1974.
MLA-čujuhus (9. p.)Sauvy, Jean, juo Simonne Sauvy. The Child's Discovery of Space. Penguin Educaction, 1974.
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