BULMAN, O M.B. Part V, Graptolithina (Revised), Complete Volume. Treatise on Invertebrate Paleontology, [S. l.], 1970. DOI: 10.17161/tip.v0i0.5413. Disponível em: https://journals.ku.edu/InvertebratePaleo/article/view/5413.. Acesso em: 1 may. 2024.