(en) Trevor Kletz, « Must Plant Modifications Lead to Accidents? », Imperial Chemical Industries Limited Petrochemicals Division Safety Newsletter, no 83, (lire en ligne [archive du ], consulté le )– reprinted, with slight modifications in Chemical Engineering Progress, Vol 2, No 11, November 1976, p. 48
web.archive.org
(en) Trevor Kletz, « Must Plant Modifications Lead to Accidents? », Imperial Chemical Industries Limited Petrochemicals Division Safety Newsletter, no 83, (lire en ligne [archive du ], consulté le )– reprinted, with slight modifications in Chemical Engineering Progress, Vol 2, No 11, November 1976, p. 48