Shimunek, Andrew E (2017). Languages of Ancient Southern Mongolia and North China: A Historical-Comparative Study of the Serbi or Xianbei Branch of the Serbi-Mongolic Language Family, with an Analysis of Northeastern Frontier Chinese and Old Tibetan Phonology. doi:10.2307/j.ctvckq4f7.
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Shimunek, Andrew (2017). Languages of Ancient Southern Mongolia and North China: a Historical-Comparative Study of the Serbi or Xianbei Branch of the Serbi-Mongolic Language Family, with an Analysis of Northeastern Frontier Chinese and Old Tibetan Phonology. Wiesbaden: Harrassowitz Verlag. ISBN978-3-447-10855-3. OCLC993110372.