Jager, D. H. d. (1963). Sillimanite in Namaqualand: Review of reserves and report on some low-grade deposits. Government Printer.
Chicago-Zitierstil (17. Ausg.)Jager, D. H. de. Sillimanite in Namaqualand: Review of Reserves and Report on Some Low-grade Deposits. Pretoria: Government Printer, 1963.
MLA-Zitierstil (9. Ausg.)Jager, D. H. de. Sillimanite in Namaqualand: Review of Reserves and Report on Some Low-grade Deposits. Government Printer, 1963.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.