Hamlett, W.C. & Miglino, M.A. & Federman, D.J. & Schafer, P.J. & Didio, L.J. (1993)
Fine structure of the term umbilical cord in the Atlantic sharpnose shark, Rhizoprionodon terraenovae.
Journal of Submicroscopic Cytology and Pathology, 25(4), 547–557