Hyder, S.L. & Cayer, M.L. & Pettey, C. (1983)
Cell types in peripheral blood of the nurse shark: An approach to structure and function. Tissue and Cell, 15(3), 437–455
DOI: 10.1016/0040-8166(83)90075-7

Smith, D.S. & Cayer, M.L. & Russell, F.E. (1974)
Membrane-limited microtubular aggregates in the venom secreting cells of a stingray. Toxicon, 12(3), 331–335
DOI: 10.1016/0041-0101(74)90080-4