Peter Haasen ; translated by Janet Mordike. Jean Piaget ; translated by Margaret Cook. Rolf-Dieter Mu?ller ; translated by Janice W. Ancker. A. I. Busev ; translated by J. Schmorak Edited and translated by David Williams Edited and translated by Harro Hopfl Walter Huckel ; translated by L.H. Long. edited and translated by David Williams. edited and translated by Eric Watkins. edited and translated by Harro H?pfl.