por Opschoor, Johannes Baptist, 1944- , 1944- [editor] | Button, Kenneth John, 1948- [editor] | Nijkamp, Peter [editor].
por Fischer, Manfred M, 1947- [editor] | Button, Kenneth John [editor] | Nijkamp, Peter [editor].
por Rietveld, Piet [editor] | Button, Kenneth John, 1948- [editor] | Nijkamp, Peter [editor].