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Germany | |
| Weiß, Stefan (1990) Mineralfundstellen Atlas Deutschland West. Christian Weise Verlag, Munich, Germany. 320pp. |
| Koritnig, S. (1954): Contributions to Mineralogy and Petrography 4, 89-98. |
| Theye, T. & Siedel, H. (1993): Chloritoid, carpholite, and sudoite in very low-grade metamorphic rocks of the Wippra Metamorphic Zone (Harz, Germany). Neues Jahrbuch für Mineralogie, Monatshefte 1993, 73-96. |