Palmer, A. R. (1964). An unusual lower Cambrian trilobite fauna from Nevada: Twelve species representing the olenellidae, Oryctocephalidae, Ogygopsidae, Dorypygidae, Zacanthoididae, and Ptychopariidae are described and figured. United States Government Print. Office.
Chicago-Zitierstil (17. Ausg.)Palmer, Allison R. An Unusual Lower Cambrian Trilobite Fauna from Nevada: Twelve Species Representing the Olenellidae, Oryctocephalidae, Ogygopsidae, Dorypygidae, Zacanthoididae, and Ptychopariidae Are Described and Figured. Washington, DC: United States Government Print. Office, 1964.
MLA-Zitierstil (9. Ausg.)Palmer, Allison R. An Unusual Lower Cambrian Trilobite Fauna from Nevada: Twelve Species Representing the Olenellidae, Oryctocephalidae, Ogygopsidae, Dorypygidae, Zacanthoididae, and Ptychopariidae Are Described and Figured. United States Government Print. Office, 1964.