1. Sting R1 Instruction Manual, Release 01.01.38;AGI,2005
2. Ahmed M Youssef, Hesham El-Kaliouby and Yasser A Zabramawi (2012). Sinkhole detection using electrical resistivity tomography in Saudi Arabia. J. Geophys. Eng. 9, 655–663. Online publication date: 1-Dec-2012. Read More: 10.1190/1.1443142.
3. A survey of current trends in near-surface electrical and electromagnetic methods;Auken;Geophysics,2006
4. Use of ground-penetrating radar for assessment of potential sinkhole conditions: an example from Ghor al Haditha area, Jordan;Batayneh;Environ. Geol.,2002
5. The Sinkhole Hazard in Pinellas County: A Geologic Summary For Planning Purposes;Beck,1991