References:

- http://encyclopedia.kids.net.au/page/st/Strong_nuclear_force

- http://www.innovateus.net/science/what-strong-nuclear-force

- http://physics.tutorvista.com/modern-physics/nuclear-force.html?view=simple

- http://scienceforkids.kidipede.com/chemistry/atoms/strongforce.htm

- http://scienceblogs.com/startswithabang/files/2012/06/atomsToQuarks_1-590x273.gif

- https://visitfisika.files.wordpress.com/2008/07/untitled.jpg

- http://www.physics-and-radio-electronics.com/physics/natural-forces/strong-nuclear-force.html

- http://mindblowingphysics.pbworks.com/w/page/52043997/The%20Four%20Forces%202012

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