Não informado. (1999). International Mining & Minerals. Institution of Mining Engineers.
Chicago-Zitierstil (17. Ausg.)Não informado. International Mining & Minerals. Doncaster, Inglaterra: Institution of Mining Engineers, 1999.
MLA-Zitierstil (8. Ausg.)Não informado. International Mining & Minerals. Institution of Mining Engineers, 1999.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.