A. Putnis, J. Grace, W. E. Cameron: Blaubleibender covellite and its relationship to normal covellite. In: Contributions to Mineralogy and Petrology. 60, 1977, S. 209–217, doi:10.1007/BF00372282.
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books.google.de
Hubert Lloyd Barnes: Geochemistry of hydrothermal ore deposits, Band 1. 3. Auflage, John Wiley and Sons, 1997, ISBN 0-471-57144-X, S. 390–392 (eingeschränkte Vorschau in der Google-Buchsuche).
R.J. Goble: Copper sulfides from Alberta: yarrowite,Cu8S9, and spionkopite, Cu39S28. In: Canadian Mineralogist. 1980, 18, S. 511–518 (Abstract in American Mineralogist, S. 1279; PDF; 873 kB).