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来源: www.un.org - United Nations resources on state sovereignty and international law, www.cfr.org - Council on Foreign Relations, geopolitics and boundary analysis, www.cia.gov/the-world-factbook - CIA World Factbook, territorial and political data, www.state.gov - US State Department, international law and boundary treaties, www.brookings.edu - Brookings Institution, political geography research, www.wilsoncenter.org - Wilson Center, Cold War geopolitics history, www.fco.gov.uk - British Foreign and Commonwealth Office, territorial disputes, www.africaunion.org - African Union, member states and territorial issues, www.nato.int - NATO, alliance geography and membership, www.ploughshares.ca - Project Ploughshares, conflict and political geography, www.refworld.org - UNHCR Refworld, stateless peoples and refugee issues, Oxford University Press, academic political geography texts, www.rgs.org - Royal Geographical Society, Mackinder and classical geopolitics, www.freedomhouse.org - Freedom House, political rights and state governance