[Palaeontological descriptions. Section Mollusca. Class Cephalopoda.] Luppov, N.P.; Alekseeva, L.V.; Bogdanova, T.N.; Korotkov, V.A.; Dzhalilov, M.R.; Lobacheva, S.V.; Kuzmicheva, E.I.; Akopyan, V.T.; Smirnova, S.B.[The Valanginian of Mangyshlak.], Nauka, Moscow, 1983: 72-87, 114-116. Chapter pagination: 49-72, 112-113. 71 [Zoological Record Volume 125]