1. Chen Y.J. and Kulhawy F.H. (2002). "Evaluation of Drained Axial Capacity of Drilled Shafts" Deep Foundations 2002 (GSP 116) Ed. MW O'Neill and FC Townsend ASCE Reston 2 1200-1214.
2. Fang Y.C. (2007). "Evaluation of Tip Resistance and Compression Interpretation Criteria for Drilled Shafts" M.S. Thesis Chung Yuan Christian Univ. Taiwan.
3. Hirany A. and Kulhawy F.H. (1988). "Conduct and Interpretation of Load Tests on Drilled Shaft Foundations: Detailed Guidelines" Rpt. EL-5915(1) Electric Power Research Institute Palo Alto.