Why did the Soviet Union invade Afghanistan

IMPORTANT: MUST USE THESE SOURCES IN THE ESSAY, ALONG WITH OTHERS OF YOUR CHOOSING.

http://digitalarchive.wilsoncenter.org/collection/76/soviet-invasion-of-afghanistan

Gary Jeffrey. The Soviet War in Afghanistan (2013)

Coll, Steve. Ghost Wars. Penguin, 2004

Cordovez, Diego. Out of Afghanistan: The Inside Story of the Soviet Withdrawal. Oxford U.P., 1995

CIA study of economic costs, 1987http://www.foia.cia.gov/sites/default/files/document_conversions/89801/DOC_0000499320.pdf

CIA study of impact on Soviet society, 1999
http://www.foia.cia.gov/sites/default/files/document_conversions/89801/DOC_0000500659.pdf

Braithwaite, Rodric. Afgantsy: The Russians in Afghanistan, 1979-89, Profile Books, 2011. (available from Toronto Public Library)

Afghanistan: Lessons from the Last War, declassified Soviet documents:
http://nsarchive.gwu.edu/NSAEBB/NSAEBB57/soviet.html

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