1. International Labour Organization: Labor Accidents Rateshttp://www.oit.org/
2. Work-Related Traumatic Injury Fatalities Australia 2013,2014
3. Fatal and Serious Accidents in the Chilean Mining Industry,2015
4. Statistics: All Mininghttp://www.cdc.gov
5. An Overview of Underground Coal Miner Electronic Tracking System Technologies;Sunderman,2012