¹ “Quotations by James Clerk Maxwell.” Quotations by Maxwell. Accessed December 21, 2015. http://www-history.mcs.st-andrews.ac.uk/Quotations/Maxwell.html.

² Shmoop Editorial Team. “Potential and Kinetic Energy - Shmoop Biology.” Shmoop.com. Accessed December 21, 2015. /energy-flow-enzymes/potential-kinetic-energy.html.

³ Shmoop Editorial Team. “Electricity and Magnetism Learning Guide.” Shmoop.com. Accessed December 21, 2015. /electricity-magnetism/.

⁴ Shmoop Editorial Team. “Electricity and Magnetism Learning Guide.” Shmoop.com. Accessed December 21, 2015. /electricity-magnetism/.

⁵ Shmoop Editorial Team. “Electricity and Magnetism Learning Guide.” Shmoop.com. Accessed December 21, 2015. /electricity-magnetism/.

⁶ Shmoop Editorial Team. “Electricity and Magnetism Learning Guide.” Shmoop.com. Accessed December 21, 2015. /electricity-magnetism/.

⁷ Shmoop Editorial Team. “Bonding: Covalent and Ionic Bonds - Shmoop Chemistry.” Shmoop.com. Accessed December 16, 2015. /bonds-orbitals/bonding.html.

⁸ Shmoop Editorial Team. “Special Relativity - Shmoop Physics.” Shmoop.com. Accessed December 16, 2015. /special-relativity.