1. Trilobites of the Upper Ordovician of Bukantau;Abdullaev,1972
2. Ashgill Trilobites of Kazakhstan;Apollonov,1974
3. Ordovician trilobite assemblages of Kazakhstan;Apollonov;Fossils Strata,1975
4. The Lower Palaeozoic Brachiopoda and trilobite faunas of Anglesey;Bates;Bull. Br. Mus. (nat. Hist.) Geol.,1968
5. Trilobites from the Ordovician and Silurian Beds of Pamir;Balashova;Trudy Uprav. geol. sov. Minist. Tadzhik Paleont. Stratig.,1966