Chernysheva 1960. Class Trilobita. Trilobites Principles of Palaeontology. Arthropods-Trilobitomorphs and Crustaceans., Yu. A. Orlov [ed.], Principles of Palaeontology. Arthropods-Trilobitomorphs and Crustaceans [ed. N. E. Chernysheva]. Moscow 1960: 17-194 pls. i-xii text-figs. 1-427 errata slip [Co-authors E. A. Balashova, N. K. Ivshin, N. N. Kramarenko, Z. A., 1960: 17-194. Chapter pagination: 17-194