Sen, D. (1975). Basic principles of geopolitics and history, thoeretical aspect of international ralations. Concept Publishing.
শিকাগো স্টাইলে সাইটেশনSen, Debabrata. Basic Principles of Geopolitics and History, Thoeretical Aspect of International Ralations. Delhi: Concept Publishing, 1975.
এমএলএ সাইটেশনSen, Debabrata. Basic Principles of Geopolitics and History, Thoeretical Aspect of International Ralations. Concept Publishing, 1975.
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