Ref.:
- Cairncross, B., Beukes, N. and Gutzmer, J. (1997): The manganese adventure – the South African manganese fields. Associated Ore & Metal Corporation Limited, Johannesburg, Republic of South Africa, 236 pp.
- Hochleitner, R. (1986): Neufund von Gaudefroyit-Kristallen in Südafrika. LAPIS 11 (6), 19-20