"Isaac Newton als Mathematiker" [Isaac Newton as a mathematician Markus Fierz]. Naturforschende Gesellschaft in Zürich (in German). Archived from the original on 6 September 2012. Retrieved 20 December 2013.
"Sizarships". Churchill College. Retrieved 10 January 2018.
ngzh.ch
"Isaac Newton als Mathematiker" [Isaac Newton as a mathematician Markus Fierz]. Naturforschende Gesellschaft in Zürich (in German). Archived from the original on 6 September 2012. Retrieved 20 December 2013.