The Praemonenda de rationibus et usu operis offer an extensive introduction to the Thesaurus and how to use it. The printed edition is – apart from a Latin version – available in 7 languages: English, French, German, Italian, Russian, Spanish and Japanese. Every printed edition of the Thesaurus contains the Praemonenda; they are also available in bookshops and can be consulted online (s. https://tll.degruyter.com/help).The Japanese version is only available online here.
In terms of content, you will find the same information under User Tools on this website.
Thesaurus linguae Latinae, Praemonenda, 1990, ISBN 978-3-598-70765-0