Não informado. (1976). IMM Bulletin. Institution of Mining and Metallurgy.
Lua i Stíl Chicago (17ú heag.)Não informado. IMM Bulletin. London: Institution of Mining and Metallurgy, 1976.
Lua MLA (8ú heag.)Não informado. IMM Bulletin. Institution of Mining and Metallurgy, 1976.
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