Ruiz-Trillo, I., I; Ruiz-Trillo, Iñaki; Riutort, Marta; Littlewood, D. Timothy J.; Herniou, Elisabeth A.; Baguñà, Jaume, M (March 1999). «Acoel Flatworms: Earliest Extant Bilaterian Metazoans, Not Members of Platyhelminthes». Science283 (5409): 1919–1923. doi:10.1126/science.283.5409.1919. ISSN0036-8075. PMID10082465.
Ruiz-Trillo, I., I; Ruiz-Trillo, Iñaki; Riutort, Marta; Littlewood, D. Timothy J.; Herniou, Elisabeth A.; Baguñà, Jaume, M (March 1999). «Acoel Flatworms: Earliest Extant Bilaterian Metazoans, Not Members of Platyhelminthes». Science283 (5409): 1919–1923. doi:10.1126/science.283.5409.1919. ISSN0036-8075. PMID10082465.
Ruiz-Trillo, I., I; Ruiz-Trillo, Iñaki; Riutort, Marta; Littlewood, D. Timothy J.; Herniou, Elisabeth A.; Baguñà, Jaume, M (March 1999). «Acoel Flatworms: Earliest Extant Bilaterian Metazoans, Not Members of Platyhelminthes». Science283 (5409): 1919–1923. doi:10.1126/science.283.5409.1919. ISSN0036-8075. PMID10082465.