MERTON, Robert King. Social Theory and Social Structure. New York: The Free Press, 1968. 702 s. Dostupné online. ISBN0-02-921130-1. S. 20.
ROSENTHAL, Robert; JACOBSON, Lenore. Pygmalion in the Classroom: Teacher Expectation and Pupils' Intellectual Development. New York: [s.n.], 1968. Dostupné online.