Gaya APA

UNEP-IEO, . (1989). Technical Report Series Environmental Aspects of SElected Non-Ferrous Metals ore mining a Technical Guide (Cu, Ni, Pb, Zn, Au . : UNEP-IEO.

Gaya MLA

UNEP-IEO, . "Technical Report Series Environmental Aspects of SElected Non-Ferrous Metals ore mining a Technical Guide (Cu, Ni, Pb, Zn, Au". : UNEP-IEO, 1989. Text.