Genrikh Jagoda (file card from moskowian records of secret czarist police Okhrana )
Unknown author<span style="display: none;">Unknown author</span>
Russian state archive: <a rel="nofollow" class="external free" href="http://www.rusarchives.ru/evants/exhibitions/xviiexp/311.shtml">http://www.rusarchives.ru/evants/exhibitions/xviiexp/311.shtml</a><br>ГАРФ. Ф.1742. Оп.1. Д.43214. Л.1.