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Harmony

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

MAR+LOWE

Learn Korean – The Language Workbook for Beginners: An Easy, Step-by-Step Study Book and Writing Practice Guide for Learning How to Read, Write, and ... the Hangul Alphabet (Flashcard Pages Inside!)

DK

15 Minute French: Learn in Just 12 Weeks        

Independently published

Comparative Grammar of Spanish, Portuguese, Italian and French: Learn & Compare 4 Languages Simultaneously

The Multilingual Patrician: Learning to Learn Languages (English Edition)

Tuttle Publishing

Learn Japanese With Manga: A Self-study Language Book for Beginners - Learn to Read, Write and Speak Japanese With Manga Comic Strips! (Free Online Audio) (1)

One Road to Fluency: How An Adult Learns A New Language (English Edition)

Pimsleur

How to Learn a Foreign Language (English Edition)

Learn Spanish In Your Car: 100 Days To Fluency With Comprehensive Lessons, Essential Vocabulary, And Practical Phrases For Adults Seeking Beginner To Intermediate Mastery (English Edition)

Independently published

American Sign Language For Beginners: Your Comprehensive Guide To Rapidly Learning Asl, From Basics To Advanced Conversations | Effective Techniques For Quick Learning