(en) Richard C. Brusca, Wendy Moore et Stephen M. Shuster, Invertebrates, Sunderland (Mass.), OUP USA, , 1104 p. (ISBN978-1-60535-375-3, lire en ligne)
doi.org
dx.doi.org
(en) Edwin Ray Lankester, « On the primitive cell-layers of the embryo as the basis of genealogical classification of animals, and on the origin of vascular and lymph systems », Annals And Magazine of Natural History, 4e série, vol. 11, no 65, , p. 321-338 (ISSN0374-5481, DOI10.1080/00222937308696824)
issn.org
portal.issn.org
(en) Edwin Ray Lankester, « On the primitive cell-layers of the embryo as the basis of genealogical classification of animals, and on the origin of vascular and lymph systems », Annals And Magazine of Natural History, 4e série, vol. 11, no 65, , p. 321-338 (ISSN0374-5481, DOI10.1080/00222937308696824)