SIL International serves language communitites worldwide through research, translation, training and materials development. They have an extensive variety of language learning books in the resources section of their website.
The Institute of Strategic Languages and Cultures offers one-year intensive courses in Russian, Chinese, and Arabic. Students study not only the language, but also history and culture.
BOOKS ON LANGUAGE ACQUISITION:
Language Acquisition Made Practical by E. Thomas Brewster and Elizabeth S. Brewster