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https://soclaimon.wordpress.com/2012/02/14/%e0%b8%9a%e0%b8%97%e0%b8%97%e0%b8%b5%e0%b9%88-6-%e0%b8%81%e0%b8%b2%e0%b8%a3%e0%b9%80%e0%b8%88%e0%b8%a3%e0%b8%b4%e0%b8%8d%e0%b9%80%e0%b8%95%e0%b8%b4%e0%b8%9a%e0%b9%82%e0%b8%95%e0%b9%81%e0%b8%a5/
บทที่ 6 การเจริญเติบโตและการพัฒนา