L’Heure décisive par Henri Ardel
<div class="fn value">
Henri Ardel</div>
scanned book (Internet Archive <a rel="nofollow" class="external free" href="https://archive.org/details/lheuredcisive00arde/page/n8">https://archive.org/details/lheuredcisive00arde/page/n8</a>)