1. 1
    Beijing guan hua yu yin yan jiu /
    北京官话语音研究 /
    by Zhang, Shifang, 1973-
    Published 2010
    Book
  2. 2
    Beijing yin xi jie xi /
    北京音系觧析 /
    by Xue, Fengsheng, 1931-
    Published 1986
    Book