Internet, http://en.wikipedia.org/wiki/Edgar_Heilbronner, 2013-02-26
Angewandte Chemie International Edition, Volume 45, Issue 41, page 6784, October 20,
2006
Reflections on symmetry : in chemistry and elsewhere / Edgar Heilbronner, Jack D.
Dunitz ; ill. by Ruth Pfalzberger, 1993