Gopalakrishnan, R. (1991). Political geography of India's North East. Vikas.
Citazione stile Chigago Style (17a edizione)Gopalakrishnan, Ramamoorthy. Political Geography of India's North East. New Delhi: Vikas, 1991.
Citatione MLA (9a ed.)Gopalakrishnan, Ramamoorthy. Political Geography of India's North East. Vikas, 1991.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.