Fluent Forever Deutsch

Harmony/Rodale/Convergent

Fluent Forever (Revised Edition): How to Learn Any Language Fast and Never Forget It

Maria Spantidi

Fluent For Free: How to Learn Any Language at No Cost and Change your Life in the Process

Tck Publishing

Unlimited Memory: How to Use Advanced Learning Strategies to Learn Faster, Remember More and be More Productive

Superbad                                        

320 speaking questions to become fluent in German, bilingual edition German/English, for all levels (English Edition)

Independently Published

German Language for Beginners: The Ultimate Guide to Improve Your German, Learning New Skills with Phrases and Advanced Techniques from a Basic German to Forever Fluent