Which book explained Charles de Gaulle’s argument for a professional mechanized army?

Charles de Gaulle argued for the creation of a small, highly mechanized, and mobile professional army in his 1934 book titled Vers l’armée de métier (published in English as The Army of the Future).1

In this work, he challenged the prevailing French military reliance on static defense theories, such as those exemplified by the Maginot Line, which he believed were inadequate for protecting France against the threat of German aggression.1