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USA | |
| Van Kauwenbergh, S.J., Cooper-Fleck, M., Williams, M.R. (1988) The occurrence of robertsite in a sedimentary phosphate ore from Thailand. Mineralogical Magazine: 52: 505-508. |
| Moore, Paul Brian, Ito, J. (1974) I. Jahnsite, segelerite, and robertsite, three new transition metal phosphate species. II. Redefinition of overite, an isotype of segelerite. III. Isotypy of robertsite, mitridatite, and arseniosiderite. American Mineralogist, 59 (1-2) 48-59 |
| Van Kauwenbergh, S.J., Cooper-Fleck, M., Williams, M.R. (1988) The occurrence of robertsite in a sedimentary phosphate ore from Thailand. Mineralogical Magazine: 52: 505-508. |
| Smith, Arthur E., Fritzsch, Eric (2000) SOUTH DAKOTA. Rocks & Minerals, 75 (3) 156-169 doi:10.1080/00357520009605635 |
Tip Top Mine, Fourmile, Custer Mining District, Custer County, South Dakota, USA