Here are some useful and important links.
Government
Chamber
Australian -Thai Chamber of Commerce
Thai - Canadian Chamber of Commerce
Thai - Chinese Chamber of Commerce
Danish - Thai Chamber of Commerce
Franco - Thai Chamber of Commerce
Thai - Findish Chamber of Commerce
German - Thai Chamber of Commerce
Thai - Hongkong Trade Association
Thai - Italian Chamber of Commerce
Thai - Norwegian Chamber of Commerce
Singapore - Thai Chamber of Commerce
South African - Thai Chamber of Commerce