Keenan, T. (2002). An introduction to child development. SAGE Publications.
Lua i Stíl Chicago (17ú heag.)Keenan, Thomas. An Introduction to Child Development. London ; Thousand Oaks, Calif.: SAGE Publications, 2002.
Lua MLA (8ú heag.)Keenan, Thomas. An Introduction to Child Development. SAGE Publications, 2002.
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