Dennis E. Becker. “Testing in Geotechnical Design”. Geotechnical Engineering Journal of the SEAGS & AGSSEA 41, no. 1 (March 31, 2010): 17–28. accessed September 12, 2026. https://ph01.tci-thaijo.org/index.php/SEAGS_AGSSEA_Journal/article/view/259619.