Complexity of Games and Puzzles (页面存档备份,存于互联网档案馆) 围棋与数学 已解遊戲 香农数(英语:Shannon number) listofNP-complete games and puzzles listof PSPACE-complete games and
End Investigation (complete text) [Postanowienie o umorzeniu śledztwa] (PDF). Instytut Pamięci Narodowej, Oddziałowa Komisja SZpNP, Białystok. [2019-03-12]
Michael Power, Religion in the Reich: the Nazi Persecution of Christianity, an Eye Witness Report (n.p.: Longman's Green and Co. Ltd., 1939). Miguel Power,