i) Some Persons and Personalities at Bow Bazar Science Association 1925- 1930 by C Mahadevan, ii) Biographical Memoir of Fellows of the Royal Society- Volume 13- Kariamanikkam Srinivasa Krishnan, iii)Krishnan, Friend and Philosopher, iv) Abstract from a talk delivered by Dr J H Van Vleck on Dangerous Gulfs: Some Reflections on the Social Implications of Computing Machines.