Kolobova, I. M.; Popov, L. E. (1986). K paleontologicheskoj kharakteristike anderkenskogo gorizonta srednego ordovika v Chu-ilijskikh gorakh (yuzhnyj Kazakhstan) [On the palaeontological characteristics of the Middle Ordovician Anderken Formation in the Chu-ilijski mountains (southern Kazakhstan)]. <em>Ezhegodnik Vsesoyuznogo Paleontologicheskogo Obshchestva.</em> 28: 50-68 [Alternatively 29: 246-261].

original description

Percival, I. G.; Wright, A. J.; Cooper, R. A.; Simes, J. E.; Zhen, Y. Y. (2009). Middle Ordovician (Darriwilian) brachiopods and trilobites from Thompson Creek, Northwest Nelson, New Zealand. <em>Memoirs of the Association of Australasian Palaeontologists.</em> 37: 611-639.

basis of record