1. Pappas, C.: Top 10 e-Learning Statistics for 2014 You Need to Know (2014). http://elearningindustry.com/top-10-e-learning-statistics-for-2014-you-need-to-know
2. Lutz, M., Lutz, E.A.: The future of training in a data-driven mining industry. In: SME Annual Meeting, 24 February 2016. SME, Phoenix (2016)
3. McWilliams, L.J., Lenart, P.J., Lancaster, J.L., Zeiner Jr, J.R.: National Survey of the Mining Population: Part II Mines. U.S. Department of Health & Human Services, CDC/NIOSH IC 9528, NIOSH Pub. 2012-153 (2012)
4. Dale, E.: Audio-Visual Methods in Teaching, 3rd edn. Dryden Press, New York (1969)
5. Peters, R.H., Vaught, C., Mallett, L.: A Review of NIOSH & US Bureau of Mines research to improve miner’s health & safety training. In: Brune, J. (ed.) Extracting the Science: A Century of Mining Research, pp. 501–509. Society for Mining, Metallurgy & Exploration, Littleton (2010)