1. Abu-Hejleh N. and Atwooll W. (2005). "Colorado's axial load tests on drilled shafts socketed in weak rocks: Synthesis and future needs" Colorado's Department of Transpiration Research Branch No. CDOT-DTD-R-2005-4.
2. Argema. (1992). "Design guides for offshore structures: offshore pile design." In: Tirant PL editor. Association de Recherche en Geotechnique Marine. Editions Technip Paris France.
3. Aurora R.P. and Reese L.C. (1976). "Behavior of Axially Loaded Drilled Shafts in Clay-Shales." Center of Highway researches the University of Texas No. CFHR 3-5-72-176-4 Intrm Rpt.
4. Load Transfer Characteristics of Socketed Piles in Mumbai Region