Tohutoro APA (7th ed.)

Gopalakrishnan, R. (1991). Political geography of India's North East. Vikas.

Tohutoru Kātū Chicago (17th ed.)

Gopalakrishnan, Ramamoorthy. Political Geography of India's North East. New Delhi: Vikas, 1991.

Tohutoro MLA (9th ed.)

Gopalakrishnan, Ramamoorthy. Political Geography of India's North East. Vikas, 1991.