Symposium on the Theoretical Background to the Planning of Open Pit Mines with Special Reference to Slope Stability, Johannesburg, South African Institute of Mining and Metallurgy, & Van Rensburg, P. W. J. (1971). Planning open pit mines: Proceedings .. Balkema (A.A.), for the South African Institute of Mining and Metallurgy.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Symposium on the Theoretical Background to the Planning of Open Pit Mines with Special Reference to Slope Stability, Johannesburg, South African Institute of Mining and Metallurgy, و P. W. J. Van Rensburg. Planning Open Pit Mines: Proceedings .. Cape Town: Balkema (A.A.), for the South African Institute of Mining and Metallurgy, 1971.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Symposium on the Theoretical Background to the Planning of Open Pit Mines with Special Reference to Slope Stability, Johannesburg, et al. Planning Open Pit Mines: Proceedings .. Balkema (A.A.), for the South African Institute of Mining and Metallurgy, 1971.