QS World University Rankings: top 10 (2011-2015)

Reference 1: Massachusetts Institute of Technology, Stanford University, Harvard University, University of Cambridge, California Institute of Technology, University of Oxford, University College London, Swiss Federal Institute of Technology in Zurich, Imperial College London and University of Chicago.

Reference 2: 2011/12[50], 2013/14[52] and 2015/16[54].

Source: http://en.wikipedia.org/wiki/QS_World_University_Rankings