Sources:
- http://www.biography.com/people/john-dalton-9265201
- http://www.youtube.com/watch?v=_nLESblUAHY
- http://www.livescience.com/32016-niels-bohr-atomic-theory.html
- http://www.iun.edu/~cpanhd/C101webnotes/modern-atomic-theory/rutherford-model.html
- http://www.biography.com/people/erwin-schr%C3%B6dinger-9475545
- http://library.thinkquest.org/C006669/data/Chem/atomic/development.html
- http://www.egs.edu/library/democritus/biography/
- http://abyss.uoregon.edu/~js/21st_century_science/lectures/lec05.html
- http://www.iun.edu/~cpanhd/C101webnotes/composition/dalton.html
- http://www.nobelprize.org/nobel_prizes/physics/laureates/1906/thomson-bio.html
- http://www.kutl.kyushu-u.ac.jp/seminar/MicroWorld1_E/Part2_E/P24_E/Thomson_model_E.htm
- http://www.nobelprize.org/nobel_prizes/physics/laureates/1922/bohr-bio.html
- http://csep10.phys.utk.edu/astr162/lect/light/bohr.html
- http://www.nobelprize.org/nobel_prizes/chemistry/laureates/1908/rutherford-facts.html
- http://abyss.uoregon.edu/~js/ast123/lectures/lec04.html
- http://www.abcte.org/files/previews/chemistry/s1_p6.html
- http://www.colorado.edu/physics/2000/quantumzone/schroedinger.html
- http://chemed.chem.purdue.edu/genchem/history/millikan.html
- As well as the Chemistry book