Robert S. Hoffmann; et al. (2010). Smith, Andrew T.; Sung, Yan Xie (eds.). A Guide to the Mammals of China. Illustrator Federico Gemma; honorary editor, Wang. Princeton: Princeton University Press. p. 280. ISBN9781400834112.
Lanier, H. (2009). "Inferring divergence times pikas (Ochotona spp.) using mtDNA and relaxed molecular dating techniques". Molecular Phylogenetics and Evolution. 53 (1): 1–12. doi:10.1016/j.ympev.2009.05.035. PMID19501176.
Lanier, H. (2009). "Inferring divergence times pikas (Ochotona spp.) using mtDNA and relaxed molecular dating techniques". Molecular Phylogenetics and Evolution. 53 (1): 1–12. doi:10.1016/j.ympev.2009.05.035. PMID19501176.