Não informado. (1952). Clays and Clay Minerals. Clay Minerals Society.
Lua i Stíl Chicago (17ú heag.)Não informado. Clays and Clay Minerals. New York: Clay Minerals Society, 1952.
Lua MLA (8ú heag.)Não informado. Clays and Clay Minerals. Clay Minerals Society, 1952.
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