OSS, V. (1971). Materials and tehnology: Non-metalic ores, silicate industries and solid mineral fuels.vol 2. Longmans, J.H De bussy.
Lua i Stíl Chicago (17ú heag.)OSS, Van. Materials and Tehnology: Non-metalic Ores, Silicate Industries and Solid Mineral Fuels.vol 2. Longmans, J.H De bussy, 1971.
Lua MLA (8ú heag.)OSS, Van. Materials and Tehnology: Non-metalic Ores, Silicate Industries and Solid Mineral Fuels.vol 2. Longmans, J.H De bussy, 1971.
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