^VV Missarzhevsky (1977). "Konodonty (?) i fosfatnye problematiki kembriya Mongolii i Sibiri" [Conodonts (?) and Cambrian phosphatic problematica from Mongolia and Siberia]. Беспозвоночные Палеозоя Монголии [Paleozoic Invertebrates of Mongolia] (in Russian).
McIlroy, Duncan (2000). "A lower Cambrian protoconodont apparatus from the Placentian of southeastern Newfoundland". Lethaia. 33 (2): 95–102. doi:10.1080/00241160050150230.