Baumgarten N. A., von. Ancestors of the Successor of Caesarevich Alexey Nikolaevich. In Russian (ask us if in doubt)/Baumgarten N. A., fon. Predki Naslednika Tsesarevicha Alekseya Nikolaevicha. Chronicle of the Historical and Genealogical Society in Moscow. 1913. Issue 3. To the 300th Anniversary of the House of Romanov. SKUalb1a39db256267fd7f.