Johnson, Ashley. Examining the foundation. Safety & Health. 1 October 2001,. National Safety Council Congress & Expo [18 November 2018]. (原始内容存档于2018-11-19). (页面存档备份,存于互联网档案馆)
Johnson, Ashley. Examining the foundation. Safety & Health. 1 October 2001,. National Safety Council Congress & Expo [18 November 2018]. (原始内容存档于2018-11-19). (页面存档备份,存于互联网档案馆)
Heinrich HW. Industrial accident prevention: a scientific approach. McGraw-Hill. 1931. OCLC 571338960.quoted in Hollnagel, Erik. Safer Complex Industrial Environments: A Human Factors Approach. CRC Press. 2009. ISBN 978-1-4200-9248-6.