Katchan, G. (1982). Mineralogy and geochemistry of the Ertsberg (Gunung Bijih) and Erstberg East (Gunung Bijih Timur) skarns, Irian Jaya, Indonesia and the Ok Tedi skarns, Papua New Guinea.
Chicago-viite (17. p.)Katchan, George. Mineralogy and Geochemistry of the Ertsberg (Gunung Bijih) and Erstberg East (Gunung Bijih Timur) Skarns, Irian Jaya, Indonesia and the Ok Tedi Skarns, Papua New Guinea. 1982.
MLA-viite (8. p.)Katchan, George. Mineralogy and Geochemistry of the Ertsberg (Gunung Bijih) and Erstberg East (Gunung Bijih Timur) Skarns, Irian Jaya, Indonesia and the Ok Tedi Skarns, Papua New Guinea. 1982.
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