Richard H. Tedford, Lawrence J. Flynn, Qiu Zhanxiang, Neil D. Opdyke, William R. Downs: Yushe Basin, China; Paleomagnetically calibrated mammalian biostratigraphic standard from the late Neogene of eastern Asia. In: Journal of Vertebrate Paleontology. Band11, Nr.4, 31. Dezember 1991, ISSN0272-4634, S.519–526, doi:10.1080/02724634.1991.10011420 (tandfonline.com [abgerufen am 21. Mai 2023]).
nytimes.com
Bayard Webster: The Hipparion is still an elusive Horse. In: The New York Times. 17. November 1981, ISSN0362-4331 (nytimes.com [abgerufen am 21. Mai 2023]).
Richard H. Tedford, Lawrence J. Flynn, Qiu Zhanxiang, Neil D. Opdyke, William R. Downs: Yushe Basin, China; Paleomagnetically calibrated mammalian biostratigraphic standard from the late Neogene of eastern Asia. In: Journal of Vertebrate Paleontology. Band11, Nr.4, 31. Dezember 1991, ISSN0272-4634, S.519–526, doi:10.1080/02724634.1991.10011420 (tandfonline.com [abgerufen am 21. Mai 2023]).
Bayard Webster: The Hipparion is still an elusive Horse. In: The New York Times. 17. November 1981, ISSN0362-4331 (nytimes.com [abgerufen am 21. Mai 2023]).
Richard H. Tedford, Lawrence J. Flynn, Qiu Zhanxiang, Neil D. Opdyke, William R. Downs: Yushe Basin, China; Paleomagnetically calibrated mammalian biostratigraphic standard from the late Neogene of eastern Asia. In: Journal of Vertebrate Paleontology. Band11, Nr.4, 31. Dezember 1991, ISSN0272-4634, S.519–526, doi:10.1080/02724634.1991.10011420 (tandfonline.com [abgerufen am 21. Mai 2023]).