Book Recommendations about WWII and Poland (in Polish)?

He shut his eyes, smoking as he spoke, and tumbling out his sentences without finishing them as though some one would prevent him from phrasing them.

"The family of Ungern von Sternberg is an old family, a mixture of Germans with Hungarians--Huns from the time of Attila. My warlike ancestors took part in all the European struggles. They participated in the Crusades and one Ungern was killed under the walls of Jerusalem, fighting under Richard Coeur de Lion. Even the tragic Crusade of the Children was marked by the death of Ralph Ungern, eleven years old. When the boldest warriors of the country were despatched to the eastern border of the German Empire against the Slavs in the twelfth century, my ancestor Arthur was among them, Baron Halsa Ungern Sternberg. Here these border knights formed the order of Monk Knights or Teutons, which with fire and sword spread Christianity among the pagan Lithuanians, Esthonians, Latvians and Slavs. Since then the Teuton Order of Knights has always had among its members representatives of our family. When the Teuton Order perished in the Grunwald under the swords of the Polish and Lithuanian troops, two Barons Ungern von Sternberg were killed there. Our family was warlike and given to mysticism and asceticism.