BULMAN, O M.B. Part V, Graptolithina (Revised), Ch. 1, p. 1-49. Treatise on Invertebrate Paleontology, [S. l.], 1970. DOI: 10.17161/tip.v0i0.5409. Disponível em: https://journals.ku.edu/InvertebratePaleo/article/view/5409. Acesso em: 28 apr. 2025.