uscpublicdiplomacy.org
These publications, Cultural Diplomacy from the London based think tank Demos, and Influence and Attraction from the British Council, have something to say on the subject of culture and international relations and may be helpful. They can both be dowloaded free:
http://www.demos.co.uk/files/Cultural_diplomacy_-_web.pdf
https://www.britishcouncil.org/sites/default/files/influence-and-attract...
