Process thought in contemporary Europe - Pittenger, William Norman; Hubbeling, Hubertus Gezinus; Breuvart, Jean-Marie; Welker, Michael; Welten, Willibrordus Petrus; Van der Veken, Jan (Process studies, 1979)
S. 1-3: Great Britain / W.N. Pittenger. - S. 3-4: The Netherlands / H.G. Hubbeling. - S. 4-7: France / J.M. Breuvart. - S. 7-9: Germany / M. Welker. - S. 9-10: Rome / W.P. Welten. - S. 10-13: Belgium / J. Van der Veken