The Art of logic - What tools do we have to cut through all of the noise and constant bombardment of information thrown at us on a daily basis?
Benny Lewis's Fluent in 3 Months, is a master class in shortcutting the language learning process. Become more efficient and effective at your chosen language by implementing the strategies he talks about in his book. Even if you're happy to learn at a slower pace, this book will make sure you're not wasting your time.
Gabriel Wyner's Fluent Forever looks at strategies for maximising your memory skills and learning languages faster.