5 books
Zhongguo Di 4 CI Quan Guo Ren Kou Pu Cha Zi Liao Fen XI
Dang Dai Zhongguo Ren Kou Fa Zhan Yu Jia Ting Hu Di Bian Qian
Sun Li Zhuan
She Hui Diao Cha Yan Jiu Di Liang Hua Fang Fa
He Tang Ji Sheng