International Congress on Rock Mechanics Aachen, Germany, & Wittke, W. (1991). Berichte =: Proceedings = Comptes-rendus : siebter Internationaler Kongress über Felsmechanik, Aaachen, Deutschland, 1991. A.A. Balkema.
Chicago Style (17th ed.) CitationInternational Congress on Rock Mechanics Aachen, Germany, and W. Wittke. Berichte =: Proceedings = Comptes-rendus : Siebter Internationaler Kongress über Felsmechanik, Aaachen, Deutschland, 1991. Rotterdam ; Brookfield, VT: A.A. Balkema, 1991.
MLA (8th ed.) CitationInternational Congress on Rock Mechanics Aachen, Germany, and W. Wittke. Berichte =: Proceedings = Comptes-rendus : Siebter Internationaler Kongress über Felsmechanik, Aaachen, Deutschland, 1991. A.A. Balkema, 1991.
Warning: These citations may not always be 100% accurate.