by Witold Nowacki ; translated by Henryk Zorski. by Max Planck ; translated by Henry L. Brose. by Max Planck. Translated by Henry L. Brose. by Rudolf Otto ; translated by John W. Harvey. W. K. Nowacki ; translated by Zbigniew Olesiak. by J鑥rgen Neffe ; translated by Shelly Frish. by Heinrich Zollinger ; translated by Harry E. Nursten.