Levine, David I.; Toffel, Michael W.; Johnson, Matthew S. (2012-05-18). "Randomized Government Safety Inspections Reduce Worker Injuries with No Detectable Job Loss". Science (dalam bahasa Inggeris). 336 (6083): 907–911. doi:10.1126/science.1215191. ISSN0036-8075. PMID22605775.
Levine, David I.; Toffel, Michael W.; Johnson, Matthew S. (2012-05-18). "Randomized Government Safety Inspections Reduce Worker Injuries with No Detectable Job Loss". Science (dalam bahasa Inggeris). 336 (6083): 907–911. doi:10.1126/science.1215191. ISSN0036-8075. PMID22605775.
osha.gov
"About OSHA". Diarkibkan daripada yang asal pada 2019-06-09. Dicapai pada 2020-05-13.
"About OSHA". Diarkibkan daripada yang asal pada 2019-06-09. Dicapai pada 2020-05-13.
worldcat.org
Levine, David I.; Toffel, Michael W.; Johnson, Matthew S. (2012-05-18). "Randomized Government Safety Inspections Reduce Worker Injuries with No Detectable Job Loss". Science (dalam bahasa Inggeris). 336 (6083): 907–911. doi:10.1126/science.1215191. ISSN0036-8075. PMID22605775.