Pyenson, N. D., Vélez-Juarbe, J., Gutstein, C. S., Little, H., Vigil, D., & O’Dea, A. (2015). Isthminia panamensis, a new fossil inioid (Mammalia, Cetacea) from the Chagres Formation of Panama and the evolution of ‘river dolphins’ in the Americas. PeerJ.

Pyenson, Nicholas D., Jorge Vélez-Juarbe, Carolina S. Gutstein, Holly Little, Dioselina Vigil, und Aaron O’Dea. "Isthminia Panamensis, a New Fossil Inioid (Mammalia, Cetacea) From the Chagres Formation of Panama and the Evolution of ‘river Dolphins’ in the Americas." PeerJ 2015.

Pyenson, Nicholas D., et al. "Isthminia Panamensis, a New Fossil Inioid (Mammalia, Cetacea) From the Chagres Formation of Panama and the Evolution of ‘river Dolphins’ in the Americas." PeerJ 2015.