Dulek, Daniel. Avogadro's Number. 2012. Ted-Ed, n.p.
Dulek, Daniel. "How Big Is a Mole? (Not the Animal, the Other One.)." YouTube. YouTube, 11 Sept. 2012. Web. 29 May 2014.
Dulek, Daniel. "How Big Is a Mole? (Not the Animal, the Other One.)." YouTube. YouTube, 11 Sept. 2012. Web. 29 May 2014.