(1994). Mineral resources of Saudi Arabia: Not including oil, natural gas, and sulfur. Directorate General of Mineral Resources.
Chicago-Zitierstil (17. Ausg.)Mineral Resources of Saudi Arabia: Not Including Oil, Natural Gas, and Sulfur. Jiddah: Directorate General of Mineral Resources, 1994.
MLA-Zitierstil (9. Ausg.)Mineral Resources of Saudi Arabia: Not Including Oil, Natural Gas, and Sulfur. Directorate General of Mineral Resources, 1994.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.