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nih.gov
ncbi.nlm.nih.gov
Hiroshi Wada. Evolutionary History of Free-Swimming and Sessile Lifestyles in Urochordates as Deduced from 18S rDNA Molecular Phylogeny. „Mol. Biol. Evol.”. 15 (9), s. 1189–1194, 1998. DOI: 10.1093/oxfordjournals.molbev.a026026. PMID: 9729883.
D.-G. Shu, L. Chen, J. Han, X.-L. Zhang. An Early Cambrian tunicate from China. „Nature”. 411 (6836), s. 472–473, 2001. DOI: 10.1038/35078069. PMID: 11373678.