"thermodynamic equilibrium." A Dictionary of Astronomy. 1997. Encyclopedia.com. 11 Nov. 2009 <http://www.encyclopedia.com>.
"thermodynamic equilibrium." A Dictionary of Astronomy. 1997. Encyclopedia.com. (November 11, 2009). http://www.encyclopedia.com/doc/1O80-thermodynamicequilibrium.html
"thermodynamic equilibrium." A Dictionary of Astronomy. 1997. Retrieved November 11, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O80-thermodynamicequilibrium.html