อ้างอิง

13 มิ.ย 57 http://megatopic.blogspot.com/2013/07/albert-einstein.html

13 มิ.ย 57  http://th.wikipedia.org/wiki/%E0%B8%AD%E0%B8%B1%E0%B8%A5%E0%B9%80%E0%B8%9A%E0%B8%B4%E0%B8%A3%E0%B9%8C%E0%B8%95_%E0%B9%84%E0%B8%AD%E0%B8%99%E0%B9%8C%E0%B8%AA%E0%B9%84%E0%B8%95%E0%B8%99%E0%B9%8C