Gopalakrishnan, R. (1991). Political geography of India's North East. Vikas.
Chicago-čujuhus (17. p.)Gopalakrishnan, Ramamoorthy. Political Geography of India's North East. New Delhi: Vikas, 1991.
MLA-čujuhus (9. p.)Gopalakrishnan, Ramamoorthy. Political Geography of India's North East. Vikas, 1991.
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