Gopalakrishnan, R. (1991). Political geography of India's North East. Vikas.
Chicagoスタイル(17版)引用形式Gopalakrishnan, Ramamoorthy. Political Geography of India's North East. New Delhi: Vikas, 1991.
MLA(9版)引用形式Gopalakrishnan, Ramamoorthy. Political Geography of India's North East. Vikas, 1991.
警告: この引用は必ずしも正確ではありません.