[en] How to Learn Any Language Citadel
[es] Learn Spanish Smashwords Edition
[en] The Word Brain · A Short Guide to Fast Language Learning Flying Publisher
[en] Neural Network Methods in Natural Language Processing Morgan & Claypool
[en] [Korean Made Simple 02] • Korean Made Simple 2 Billy Go
[en] [Korean Made Simple 03] • Korean Made Simple 3 GO! Billy Korean
[en] Modern Language Adams Media
[en] Accelerated Learning and Unlimited Memory Techniques and Strategies Jimmy Cooper