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USA | |
| Seaman, David (1976) Pegmatite Minerals of the World. In Mineral Localities of Connecticut and Southeastern New York State and Pegmatite Minerals of the World. The Mineralogical Press, Connecticut. |
| Campbell, T.J., Roberts, W.L. (1986) Phosphate minerals from the Tip Top mine, Black Hills, South Dakota. The Mineralogical Record: 17: 237-254. Campbell, T.J., Roberts, W.L. (1985) Mineral Localities in the Black Hills of South Dakota. Rocks & Minerals: 60: 109-118 (117). |
| Smith, Arthur E., Fritzsch, Eric (2000) SOUTH DAKOTA. Rocks & Minerals, 75 (3) 156-169 doi:10.1080/00357520009605635 |
| Smith, Arthur E., Fritzsch, Eric (2000) SOUTH DAKOTA. Rocks & Minerals, 75 (3) 156-169 doi:10.1080/00357520009605635 |
| Rocks & Minerals: 67(6): 380-388. |
White Elephant Mine, Cicero Peak, Pringle, Custer Mining District, Custer County, South Dakota, USA