1. Campbell, M. D. & Lehr, J. H. 1973. Water Well Technology. McGraw Hill, U.S.A. 681 pp.
2. Eaton, F. M., Elliott, J. W., Hurlston, F. D., Olsen, R. S., Vanderschel, D. J. & Warren, J. P. 1976. The Cyber Service Unit: an integrated logging system. 51st Annu. Fall Tech. Conf. and Exb. Soc. Petrol. Eng. Am. Inst. Ming Eng. Paper, No. SPE6158.
3. The synthesis of fracture/strength logs using borehole geophysics: a new geotechnical service
4. International Atomic Energy Agency. 1971. Nuclear well logging in hydrogeology. Tech. Rep. Series, No. 126. Vienna. 92 pp.
5. Low cost geophysical well logs for hydrogeological investigations