Agnolin, Federico L. (July 2016) [2017]. "Unexpected diversity of ratites (Aves, Palaeognathae) in the early Cenozoic of South America: Palaeobiogeographical implications". Alcheringa: An Australasian Journal of Palaeontology. 41 (1): 101–111. doi:10.1080/03115518.2016.1184898. ISSN0311-5518.Parameter |s2cid= yang tidak diketahui akan diabaikan (bantuan)
Agnolin, Federico L. (July 2016) [2017]. "Unexpected diversity of ratites (Aves, Palaeognathae) in the early Cenozoic of South America: Palaeobiogeographical implications". Alcheringa: An Australasian Journal of Palaeontology. 41 (1): 101–111. doi:10.1080/03115518.2016.1184898. ISSN0311-5518.Parameter |s2cid= yang tidak diketahui akan diabaikan (bantuan)