The following bibliography has been generated by bringing together all references provided by our content partners. There may be duplication.
- A. J. W. Hendy. 2007. Circum-Pacific Late Cenozoic Paleobiogeography: Consideration of latitudinal gradients, provincialism and beta diversity (Unpublished taxonomic opinions).
- Bray, R. (2013). Ligula Bloch, 1782. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=105014