Louchart, Antoine; Tourment, Nicolas; Carrier, Julie (2011). "The Earliest Known Pelican Reveals 30 Million Years of Evolutionary Stasis in Beak Morphology". Journal of Ornithology. 150 (1): 15–20. doi:10.1007/s10336-010-0537-5. S2CID21016885.
Louchart, Antoine; Tourment, Nicolas; Carrier, Julie (2011). "The Earliest Known Pelican Reveals 30 Million Years of Evolutionary Stasis in Beak Morphology". Journal of Ornithology. 150 (1): 15–20. doi:10.1007/s10336-010-0537-5. S2CID21016885.