<bdi><a href="https://en.wikipedia.org/wiki/en:Gottfried_Wilhelm_Leibniz" class="extiw" title="w:en:Gottfried Wilhelm Leibniz"><span title="German mathematician and philosopher (1646–1716)">Gottfried Wilhelm Leibniz</span></a>
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1669-1704
Halina Tchórzewska-Kabata, Maciej Dąbrowski (2000). <i>Nad złoto droższe: skarby Biblioteki Narodowej (More precious than gold: treasures of the National Library)</i>. Biblioteka Narodowa. <a href="//commons.wikimedia.org/wiki/Special:BookSources/83-70092-97-7" title="Special:BookSources/83-70092-97-7">ISBN 83-70092-97-7</a>