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UK | |
| Dewey, H., and Smith, B. (1922) Special Rep. Mineral Resources G.B. 23. |
| SRK Consulting (UK) Limited (2016) Competent persons report on the mineral resources and ore reserves of Sirius Minerals in the UK. Prepared for Sirius Minerals PLC and Liberum Capital Limited. |
| Russell, A. (1927) Notice of an occurrence of niccolite and ullmannite at the Settlingstones mine, Fourstones, Northumberland and of serpierite at Ross Island mine, Killarney, Co. Kerry, Ireland. Mineralogical Magazine, vol. 21, n° 119, 383-387. |