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• Krassmann, Thomas (2005?2008). "The Giant Crystal Project" . Krassmann. Archived from the original on 2008-04-26 . Retrieved 2008-04-20 . {{ cite web }} : Unknown parameter |dead-url= ignored ( |url-status= suggested) ( help )
• Various authors (2007). "Teaching Pamphlets" . Commission on Crystallographic Teaching . Retrieved 2008-04-20 .
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• Various authors (2010). "Crystallography" . Spanish National Research Council , Department of Crystallography . Retrieved 2010-01-08 .