International Society for Rock Mechanics, International Congress On Rock Mechanics (7§ : 1991 : Aachen), & Wittke, W. (1991). Proceedings. A. A. Balkema.
Cita Chicago Style (17a ed.)International Society for Rock Mechanics, International Congress On Rock Mechanics (7§ : 1991 : Aachen), y W. Wittke. Proceedings. Rotterdam: A. A. Balkema, 1991.
Cita MLA (9a ed.)International Society for Rock Mechanics, et al. Proceedings. A. A. Balkema, 1991.
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