1. Agarwal KB, Ghanekar KD. Prediction of CBR from plasticity characteristics of soil. In: Proceeding of 2nd South-east Asian Conference on Soil Engineering, Singapore; 1970. p. 11–15.
2. Correlation between CBR values and index properties of soils: a case study of Ibiono, Oron and Onna in Akwa Ibom State;Bassey;Resources Environ,2017
3. A method of estimating the California bearing ratio of cohesive soils from plasticity data;Black;Geotechnique,1962
4. Black WPM. The strength of clay subgrades: its measurement by a penetrometer. TRRL Report. LR901; 1979.
5. Repeated loading of fine grained soils;Brown,1987