Pyenson, Nicholas D. (2015). „Isthminia panamensis, a new fossil inioid (Mammalia, Cetacea) from the Chagres Formation of Panama and the evolution of ‘river dolphins’ in the Americas”. PeerJ3, e1227. o. DOI:10.7717/peerj.1227. PMID26355720. PMC4562255.
Pyenson, Nicholas D. (2015). „Isthminia panamensis, a new fossil inioid (Mammalia, Cetacea) from the Chagres Formation of Panama and the evolution of ‘river dolphins’ in the Americas”. PeerJ3, e1227. o. DOI:10.7717/peerj.1227. PMID26355720. PMC4562255.
Pyenson, Nicholas D. (2015). „Isthminia panamensis, a new fossil inioid (Mammalia, Cetacea) from the Chagres Formation of Panama and the evolution of ‘river dolphins’ in the Americas”. PeerJ3, e1227. o. DOI:10.7717/peerj.1227. PMID26355720. PMC4562255.