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Terrascope. „Environmental Risks of Mining”. The Future of strategic Natural Resources. Cambridge, MA, SAD: Massachusetts Institute of Technology. Приступљено 10. 9. 2014.
Roberts, Dar. „Rocks and classifications”. Department of Geography, University of California, Santa Barbara. Архивирано из оригинала 31. 10. 2012. г. Приступљено 11. 11. 2012.
Roberts, Dar. „Rocks and classifications”. Department of Geography, University of California, Santa Barbara. Архивирано из оригинала 31. 10. 2012. г. Приступљено 30. 3. 2016.
Roberts, Dar. „Rocks and classifications”. Department of Geography, University of California, Santa Barbara. Архивирано из оригинала 31. 10. 2012. г. Приступљено 11. 11. 2012.
Roberts, Dar. „Rocks and classifications”. Department of Geography, University of California, Santa Barbara. Архивирано из оригинала 31. 10. 2012. г. Приступљено 30. 3. 2016.
"A Basic Sedimentary Rock Classification", L.S. Fichter, Department of Geology/Environmental Science, James Madison University (JMU), Harrisonburg, Virginia, October 2000, JMU-sed-classifАрхивирано на сајту Wayback Machine (23. јул 2011) (accessed: March 2009): separates clastic, chemical & biochemical (organic).