"Yoko Ono, a Decade After the 'Horrible Thing' : John Lennon's widow still lives under a shadow, but, she says, 'It's not a bad time'". Interview with Glenn Plaskin, articles.latimes.com. May 06, 1990.
Jawaharlal Nehru, H. N. Sethna (1981). “Proceedings of the International Seminar on Science, Technology, and Society in Developing Countries, Bombay, November 1979”