Mayr, G.; Goedert, J. L.; Vogel, O. (2016). "New late Eocene and Oligocene remains of the flightless, penguin-like plotopterids (Aves, Plotopteridae) from western Washington State, U.S.A.". Journal of Vertebrate Paleontology. 36 (4): e1163573. Bibcode:2016JVPal..36E3573M. doi:10.1080/02724634.2016.1163573. S2CID88129671.
Olson, S.L.; Hasegawa, Y. (1996). "A New Genus and Two New Species of Gigantic Plotopteridae from Japan (Aves : Pelecaniformes)". Journal of Vertebrate Paleontology. 16 (4): 742–751. Bibcode:1996JVPal..16..742O. doi:10.1080/02724634.1996.10011362.
harvard.edu
ui.adsabs.harvard.edu
Mayr, G.; Goedert, J. L.; Vogel, O. (2016). "New late Eocene and Oligocene remains of the flightless, penguin-like plotopterids (Aves, Plotopteridae) from western Washington State, U.S.A.". Journal of Vertebrate Paleontology. 36 (4): e1163573. Bibcode:2016JVPal..36E3573M. doi:10.1080/02724634.2016.1163573. S2CID88129671.
Olson, S.L.; Hasegawa, Y. (1996). "A New Genus and Two New Species of Gigantic Plotopteridae from Japan (Aves : Pelecaniformes)". Journal of Vertebrate Paleontology. 16 (4): 742–751. Bibcode:1996JVPal..16..742O. doi:10.1080/02724634.1996.10011362.
semanticscholar.org
api.semanticscholar.org
Mayr, G.; Goedert, J. L.; Vogel, O. (2016). "New late Eocene and Oligocene remains of the flightless, penguin-like plotopterids (Aves, Plotopteridae) from western Washington State, U.S.A.". Journal of Vertebrate Paleontology. 36 (4): e1163573. Bibcode:2016JVPal..36E3573M. doi:10.1080/02724634.2016.1163573. S2CID88129671.