Suggestions welcome

Although it’s rare, TextBooks sometimes contain errors that require a formal correction of the published literature. Errors can result from a seemingly minor mistake such as a typographical error or a serious omission.

We recognize that volunteering to review the book without compensation is a generous act of service on your part. This book would not be the robust, valuable resource that it is were it not for your contributions.

Accessibility mistakes

Critical to our success in reaching this goal is to ensure that all books produced using that model meet the needs of all those who will one day use them. To us, open means inclusive, so for a book to be open, it must also be accessible.

We have a form for keeping track of issues with digital Accessibility, so please let us know if you find any.

Errors and suggestions

While we tried very hard to ensure there are no mistakes in our TextBooks, it is impossible to avoid in any publication. Books4Languages actively collect and acknowledge better and more adequate examples, grammatical mistakes or improvements, content review and any correction for every Books4Languages Open TextBook title to ensure teachers and students always have the most up-to-date and correct knowledge.

We have a form for keeping track of Errors and Suggestions, so please let us know if you find any.

Errata tool

Registers users can notify about spelling mistakes they may encounter and any other type of suggestion.

On Ctrl+Enter event, the page sends selected text along with paragraph and page URL.

More information about the errata tool can be found in our Report a TextBook error page.


Books4Languages promotes access, affordability, and student success through the use of open textbooks. We invite you and your institution to join us. If you would like to make a revised/adapted version of a book, visit our contributors’ page.

If you have adopted this book, please let us know on the adoption form for the open textbook.



The Books4Languages is a collaborative projects, with people from all over the world bringing their skills and interests to join in the compilation and dissemination of knowledge to everyone, everywhere.