Iqbal, Muhammad, The Reconstruction of Religious Thought in Islam, Lecture III, originally published by Oxford University Press, 1934; available on the web link: http://www.tolueislam.com/BazmdrIqbal/AI_Reconstruction.htm
 Ibid, Lecture I.
 Maher, Derek F. and Calvin Mercer (Ed.), Religion and the Implications of Radical Life Extension, Palgrave Macmillan, 2009.
 BBC News, December 27, 1998; web link: http://news.bbc.co.uk/2/hi/health/241864.stm