- Acharya, C.L., et al. (1988). Indian J. Agric. Sci. , 58, 507-516.
- Babu, M.V.S., et al. (2008). Legume Res., 31 (30: 192-195.
- Jackson, M.L. (1973). Soil Chemical Analysis. Prentice Hall of India Pvt. Ltd. New Delhi.
- Saini, V.K. et al.. (2005). J. Indian Soc. Soil Sci., 53: 346-351.
- Tiwari, Alok, et al. (2002). J. Indian So. Soil Sci., 50: 472-475.