The optimum population for Britain : proceedings of a symposium held at the Royal Geographical Society, London, on 25 and 26 September, 1969
Biology and ethics : proceedings of a symposium held at the Royal Geographical Society, London, on 26 and 27 September 1968
Growth of population : consequences and controls : proceedings of the first Conference on Population held at Princeton, New Jersey, September 27 to 30, 1968
Traité pratique d'informatique