# Languages, Modern

Free to read here, from Project Gutenberg.

3 titles; page 1 of 1.

- [How to teach a foreign language](https://invisiblenetwork.ai/books/gutenberg/54943) by Otto Jespersen
- [The Principles of Language-Study](https://invisiblenetwork.ai/books/gutenberg/46961) by Harold E. Palmer
- [The Aural System](https://invisiblenetwork.ai/books/gutenberg/29163) by Charles Hardy