Robison, Richard A. (1964). "Late Middle Cambrian Faunas from Western Utah". Journal of Paleontology. 38 (3): 510–566. ISSN0022-3360. JSTOR1301528.
Robison, R. A. (1982). "Some Middle Cambrian Agnostoid Trilobites from Western North America". Journal of Paleontology. 56 (1): 132–160. ISSN0022-3360. JSTOR1304500.
Rigby, J. Keith (1983). "Sponges of the Middle Cambrian Marjum Limestone from the House Range and Drum Mountains of Western Millard County, Utah". Journal of Paleontology. 57 (2): 240–270. ISSN0022-3360. JSTOR1304651.
Robison, R. A. (1982). "Some Middle Cambrian Agnostoid Trilobites from Western North America". Journal of Paleontology. 56 (1): 132–160. ISSN0022-3360. JSTOR1304500.
Rigby, J. Keith (1983). "Sponges of the Middle Cambrian Marjum Limestone from the House Range and Drum Mountains of Western Millard County, Utah". Journal of Paleontology. 57 (2): 240–270. ISSN0022-3360. JSTOR1304651.