http://www.clarku.edu/research/archives/archives/FreudandJung.cfm

http://www.nasa.gov/centers/goddard/about/history/dr_goddard.html#.VG5ItMnTX10

http://clarkvoices.clarku.edu/2014/07/08/the-write-stuff/

https://clarkconnect.clarku.edu/pages/home-pages/clark-facts/2014-American-Psychological-Association

http://www.clarku.edu/research/archives/archives/g-stanley-hall.cfm

https://clarkconnect.clarku.edu/sslpage.aspx?pid=683

https://clarkconnect.clarku.edu/SSLPage.aspx?pid=430

http://www.pbs.org/wgbh/amex/pill/peopleevents/p_pincus.html

http://www.clarku.edu/aboutclark/