edited by P. W. J. van Rensburg. edited by M. E. Van Valkenburg. edited by G. S. Landsberg. edited by C.J. van Rijsbergen. edited by James H. Rittenburg. edited by Wade Van Valkenburg. edited by L. T. Evans. edited by M.L. van Beusichem. edited by A. van Cauwenberghe. edited by A.G. Evans.