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(***Book source***)

Knight, R. D. (2013). Physics for scientists and engineers: A strategic approach : with modern physics. Boston, Mass: Pearson.

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Physics 251: What is Physics Good For? (n.d.). Retrieved from http://webphysics.iupui.edu/warmup/iupui_archive/refrigerators.html

2nd Law of Thermodynamics. (n.d.). Retrieved from http://www.engineeringtoolbox.com/law-thermodynamics-d_94.html

LAWS OF THERMODYNAMICS. (n.d.). Retrieved from http://www2.estrellamountain.edu/faculty/farabee/biobk/biobookener1.html