2009

Maletz, J., Carlucci, J. and Mitchell, C. E., 2009. Graptoloid cladistics, taxonomy and phylogeny. Bulletin of Geosciences, 84, 7-19.

2005

Bates, D. E. B., Kozlowska, A. and Lenz, A. C., 2005. Silurian retiolitid graptolites: morphology and evolution. Acta Palaeontologica Polonica, 50, 705-720.

Fortey, R. A., Zhang, Y.-D. and Mellish, C., 2005. The relationships of biserial graptolites. Palaeontology, 48, 1241-1272.
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1996

Maletz, J. and Mitchell, C. E., 1996. Evolution and phylogenetic classification of the Glossograptidae and Arienigraptidae (Graptoloidea): new data and remaining questions. Journal of Paleontology, 70, 641-655.

1987

Mitchell, C. E., 1987. Evolution and phylogenetic classification of the Diplograptacea. Palaeontology, 30, 353-405.