Ralph J., Nikischer T., Hudson Institute of MineralogyMindat.org: The Mineral and Locality Database — [Keswick, VA], Coulsdon, Surrey: 2000. Праверана 30 снежня 2021.
Ralph J., Nikischer T., Hudson Institute of MineralogyMindat.org: The Mineral and Locality Database — [Keswick, VA], Coulsdon, Surrey: 2000. Праверана 30 снежня 2021.