BULMAN, O M.B. Part V, Graptolithina (Revised), ch. 3, p. 95-157. Treatise on Invertebrate Paleontology, [S. l.], 1970. DOI: 10.17161/tip.v0i0.5411. Disponível em: https://journals.ku.edu/InvertebratePaleo/article/view/5411.. Acesso em: 27 apr. 2024.