BULMAN, O M.B. Part V, Graptolithina (Revised), Index, p. 158-163. Treatise on Invertebrate Paleontology, [S. l.], 1970. DOI: 10.17161/tip.v0i0.5412. Disponível em: https://journals.ku.edu/InvertebratePaleo/article/view/5412. Acesso em: 16 apr. 2025.