Janssen A. W. (2003). "Notes on the systematics, morphology and biostratigraphy of fossil holoplanktonic Mollusca, 13. Considerations on a subdivision of Thecosomata, with the emphasis on genus group classification of Limacinidae". Cainozoic Research2(1-2): 163-170. PDFArchived 2011-07-10 at the Wayback Machine.
Janssen A. W. (2003). "Notes on the systematics, morphology and biostratigraphy of fossil holoplanktonic Mollusca, 13. Considerations on a subdivision of Thecosomata, with the emphasis on genus group classification of Limacinidae". Cainozoic Research2(1-2): 163-170. PDFArchived 2011-07-10 at the Wayback Machine.