bubblebear 83. (2556 ) .Expansion and Contraction. Inquiry. at: http:/ /www.trueplookpanya .com/True/knowledge _ youtube.php?id=143 youtube _ _ (date of inquiry September 15 , 2556 ) .
Jammer, Max. (1957.).Concepts of Force. Inquiry. At: http:/ /www. wikipedia. org/wiki .com (the inquiry September 15 , 2556 ) .
Gilbert Ajarn ลิวอิส;เมิร์ล run, double (1923 ) .Thermodynamics and the Free Energy of Chemical Substances. Inquiry. at: http:/ /www.ScienceWorld. com (the Date inquiry September 15 , 2556 ) .
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