Powell, P. (1971). 2000 accidents: A shop floor study of their causes based on 42 months' continuous observation. National Institute of Industrial Psychology.
Lua i Stíl Chicago (17ú heag.)Powell, Philip. 2000 Accidents: A Shop Floor Study of Their Causes Based on 42 Months' Continuous Observation. London: National Institute of Industrial Psychology, 1971.
Lua MLA (8ú heag.)Powell, Philip. 2000 Accidents: A Shop Floor Study of Their Causes Based on 42 Months' Continuous Observation. National Institute of Industrial Psychology, 1971.
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