Krishen, Indra. 1952. “An Historical Interpretation of the Correspondence (1831-1843) of Sir George Russell Clerk, Political Agent Ambala and Ludhiana.”
Krishen, Indra. 1952. “An Historical Interpretation of the Correspondence (1831-1843) of Sir George Russell Clerk, Political Agent Ambala and Ludhiana.” PhD diss., Panjab University.