Leach, P. Babyhood: Infant development from birth to two years. Penguin Books.
Chicago-viite (17. p.)Leach, Penelope. Babyhood: Infant Development from Birth to Two Years. Harmondsworth: Penguin Books.
MLA-viite (9. p.)Leach, Penelope. Babyhood: Infant Development from Birth to Two Years. Penguin Books.
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