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

Hamlett, W.C. & Miglino, M.A. & Didio, L.J. (1993)
Subcellular organization of the placenta in the Atlantic sharpnose shark, Rhizoprionodon terraenovae. Journal of Submicroscopic Cytology and Pathology, 25(4), 535–545

Hamlett, W.C. & Schwartz, F.J. & Didio, L.J. (1987)
Subcellular organization of the yolk syncytial-endoderm complex in the preimplantation yolk sac of the shark, Rhizoprionodon terraenovae. Cell and Tissue Research, 247(2), 275–285
DOI: 10.1007/BF00218309

Hamlett, W.C. & Allen, D.J. & Stribling, M.D. & Schwartz, F.J. & Didio, L.J. (1985)
Permeability of external gill filaments in the embryonic shark. Electron microscopic observations using horseradish peroxidase as a macromolecular tracer. Journal of Submicroscopic Cytology, 17(1), 31–40