Köpke, G., & Grundheber-Pilgram, A. (1990). The centenary of May Day: Portrait of the European Trade Union Confederation (ETUC). European Trade Union Inst.
Chicago Style (17th ed.) CitationKöpke, Günter, and Alfons Grundheber-Pilgram. The Centenary of May Day: Portrait of the European Trade Union Confederation (ETUC). Brussels: European Trade Union Inst, 1990.
MLA (9th ed.) CitationKöpke, Günter, and Alfons Grundheber-Pilgram. The Centenary of May Day: Portrait of the European Trade Union Confederation (ETUC). European Trade Union Inst, 1990.
Warning: These citations may not always be 100% accurate.