Sheldon, J.D. & Allender, M.C. & George, R.H. & Bulman, F. & Abney, K. (2018)
Reproductive hormone patterns in male and female cownose rays (Rhinoptera bonasus) in an aquarium setting and correlation to ultrasonographic staging.
Journal of Zoo and Wildlife Medicine, 49(3), 638–647 DOI: 10.1638/2017-0247.1