Han, Gang; Dusseault, Maurice B.; Detournay, Emmanuel; Thomson, Bradley J.; Zacny, Kris (2009). "2". Principles of Drilling and Excavation(PDF). Wiley (published August 31, 2009). p. 60. Archived from the original(PDF) on July 13, 2019.
"Impact drill". DIY Knowledge. Archived from the original on September 8, 2018. Retrieved September 8, 2018.
Han, Gang; Dusseault, Maurice B.; Detournay, Emmanuel; Thomson, Bradley J.; Zacny, Kris (2009). "2". Principles of Drilling and Excavation(PDF). Wiley (published August 31, 2009). p. 60. Archived from the original(PDF) on July 13, 2019.