APA Citation Resources https://owl.english.purdue.edu/owl/resource/560/01/ http://www.citationmachine.net/ http://www.bibme.org/apa/website-citation http://www.calvin.edu/library/knightcite/index.php
In-text Citation Example Rutherford's model of the atom is called the planetary model because the electrons are thought to orbit the nucleus like the planets around the sun (History, n.d). According to Rutherford's model most of the mass of the atom was concentrated in the center. (Doud, n.d) (History, n.d) Bibliography Example Contributors' names (Last edited date). Title of resource. Page #. Retrieved from http://Web address Doud, T. (n.d.). The 2,400-year search for the atom - Theresa Doud. Retrieved August 29, 2016, from http://ed.ted.com/lessons/the-2-400-year-search-for-the-atom-theresa-doud History of the Atom (n.d.). Retrieved August 29, 2016, from http://www.ck12.org/section/History- of-the-Atom-::of::-Atoms-::of::-CK-12-Physical-Science-For-Middle-School/