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http://www.nhmus.hu/~pappmin/errata.rtf &
http://www.nhmus.hu/~pappmin/addenda.rtf]
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- Racatainanu, C. P. et al. (2009): Romanian natural building stones - geology, rock types, quarries, companies and products. Vol. I. Transylvania region. 2nd, reviewed ed., Argonaut, Cluj-Napoca, Romania, 243 pp.
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- Szakáll, S. & Kristály, F., Eds. (2010): Mineralogy of Székelyland, Eastern Transylvania, Romania. Csík County Nature and Conservation Society, Miercurea-Ciuc, Romania, 321 pp. [The Székelyland formerly belonged to Hungary; it now belongs to the Harghita, Covasna, and parts of Mureş Counties; for exact map outline see
http://en.wikipedia.org/wiki/File:T%C3%B6rt_Sz%C3%A9kelyf%C3%B6ld.png]