Gaya APA
LEEUWEN, T, M, V, L, T, (, A. (1990).
The Kelian disseminated gold deposits East Kalimantan Indonesia .
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Elsevier.
Gaya MLA
LEEUWEN, Theo, M., Van;, LEACH,, Terry, (et, Al).
"The Kelian disseminated gold deposits East Kalimantan Indonesia".
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Elsevier,
1990.
Laporan.