http://http//www.ilovelibrary.com/book_detail_nologin.php?id=06600004158&group=
http://scholar.google.co.th/scholar?hl=th&q=%E0%B8%81%E0%B8%B2%E0%B8%A3%E0%B8%97%E0%B8%B2%E0%B8%A3%E0%B8%B8%E0%B8%93%E0%B8%8A%E0%B9%89%E0%B8%B2%E0%B8%87&as_ylo=&as_vis=1
http://scholar.google.co.th/scholar?hl=th&q=%E0%B8%81%E0%B8%B2%E0%B8%A3%E0%B8%97%E0%B8%B2%E0%B8%A3%E0%B8%B8%E0%B8%93%E0%B8%8A%E0%B9%89%E0%B8%B2%E0%B8%87&as_ylo=&as_vis=1
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