Buffetaut, E.; Angst, D. Stratigraphic distribution of large flightless birds in the Palaeogene of Europe and its palaeobiological and palaeogeographical implications. Earth-Science Reviews. 2014, 138: 394–408. doi:10.1016/j.earscirev.2014.07.001.
Agnolin et al, Unexpected diversity of ratites (Aves, Palaeognathae) in the early Cenozoic of South America: palaeobiogeographical implications. Alcheringa An Australasian Journal of Palaeontology · July 2016 DOI: 10.1080/03115518.2016.1184898
Janz, Lisa; et al. Dating North Asian surface assemblages with ostrich eggshell: Implications for palaeoecology and extirpation. Journal of Archaeological Science. 2009, 36 (9): 1982–1989. doi:10.1016/j.jas.2009.05.012.
Kurochkin, E.N. New representatives and evolution of two archaic gruiform families in Eurasia. Transactions of the Soviet-Mongolian Paleontological Expedition. 1981, 15: 59–85.
Zelenkov, Nikita; Boev, Zlatozar; Lazaridis, Georgios. A large ergilornithine (Aves, Gruiformes) from the Late Miocene of the Balkan Peninsula. Paläontologische Zeitschrift. 2015, 90: 145–151. doi:10.1007/s12542-015-0279-z.
Zelenkov, N. V.; Lavrov, A. V.; Startsev, D. B.; Vislobokova, I. A.; Lopatin, A. V. A giant early Pleistocene bird from eastern Europe: unexpected component of terrestrial faunas at the time of early Homo arrival. Journal of Vertebrate Paleontology. 2019: e1605521. doi:10.1080/02724634.2019.1605521.
J. G. Andersson, Essays on the cenozoic of northern China. Memoirs of the Geological Survey of China (Peking), Series A, No. 3 (1923), pp. 1–152, especially pp. 53–77: "On the occurrence of fossil remains of Struthionidae in China."; and J. G. Andersson, Research into the prehistory of the Chinese. Bulletin of the Museum of Far Eastern Antiquities 15 (1943), 1–300, plus 200 plates.