Nagendra Kr Singh, . (2000). Encyclopacedia of the Indian Biography Vol-VI [O to R]. New Delhi: A.P.H publishing co.
Nagendra Kr Singh, . 2000. Encyclopacedia of the Indian Biography Vol-VI [O to R]. New Delhi: A.P.H publishing co.
Nagendra Kr Singh, . Encyclopacedia of the Indian Biography Vol-VI [O to R]. New Delhi: A.P.H publishing co. 2000.
