User:Mr. Stradivarius/Hardest language for native English speakers

References

• "Defense Language Institute Foreign Language Center general catalog 2009-2010" (PDF). Defense Language Institute. Retrieved 2011-03-15.
• "Foreign Language Learning: A Comparative Analysis of Relative Difficulty" (PDF). National Security Agency. Retrieved 2011-03-18.
• "Language learning difficulty for English speakers". National Virtual Translation Center. 2007. Retrieved 2011-03-15.
• "Tongue twisters: In search of the world's hardest language". The Economist. 2009-12-17. Retrieved 2011-03-15.
• Brecht, Richard (February 1999). "What is the most difficult language to learn?". Johns Hopkins Magazine. Retrieved 2011-03-15.
• "Which is the hardest language?". UsingEnglish. Retrieved 2011-03-15.