
Sabhal Mòr Ostaig Lecture (December 19, 2007)
Source: The Flamingo's Smile: Reflections in Natural History
Sabhal Mòr Ostaig Lecture (December 19, 2007)
University of Colorado Leeds School of Business Commencement Address (2013)
As quoted in Our Generation Against Nuclear War (1983) by Dimitrios I. Roussopoulos.
Speech at the National Constitution Center in Pennsylvania http://www.cnn.com/2017/10/16/politics/john-mccain-joe-biden-liberty-medal/index.html (October 2017)
2010s, 2017