^Taxonomic revision and phylogeny of post-Early Permian crisis bisselli-whitei Zone conodonts with comments on late Paleozoic diversity. SM Ritter, Geologica et Palaeontologica, 1986
^Shu-zhong Shen; Dong-xun Yuan; Charles M. Henderson; Junichi Tazawa; Yi-chun Zhang (2012). "Implications of Kungurian (Early Permian) conodonts from Hatahoko, Japan, for correlation between the Tethyan and international timescales". Micropaleontology 58 (6): 505–522.
