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| O'Donoghue, Michael - Ed. (1976) The Encyclopedia of Minerals and Gemstones. Orbis Publishing Ltd.
Palache, Charles, Berman, Harry, Frondel, Clifford (1951) The System of Mineralogy (7th ed.) Vol. 2 - Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Ect. John Wiley and Sons, New York.
Frondel, Clifford, Palache, Charles (1949) Retgersite, NiSO4·6H2O, a new mineral. American Mineralogist, 34 (3-4) 188-194
American Mineralogist (1949) 34: 276.
Progr. Abstr., Mineralogical Society of America, 29th Ann. Meeting (1948) pg 6. |
Ragra Mine, Huayllay District, Pasco Province, Pasco, Peru