Dreifus C. The New York Times Science Section, p. 1.
487
Hawking S. AReader’s Companion, p. 174.
488
Введение к: Hawking S.Hawking on the Big Bang and Black Holes, p. 1.
489
Catherine de Lange, ‘The man who saves Stephen Hawking’s voice’, New Scientist, 30 December 2011, http://www.newscientist.com/article/dn21323-the-man-who-savesstephen-hawkings-voice.html#.Ul61Phb3A
