1. ASCE Task Committee Guidelines for Instrumentation & Measurements for Monitoring Dam Performance.
2. A Guide to Field Instrumentation in Geotechnics;Bassett,2012
3. Geotechnical Instrumentation for Monitoring Field Performance;Dunnicliff,1988
4. Hanna, T.H. (1985) Field Instrumentation in Geotechnical Engineering, Trans Tech Publications (out of print & difficult to find).
5. Time Lag and Soil Permeability in Ground-Water Observations, Waterways Experiment Station Corps of Engineers;Hvorslev,1951