Hsueh, Chung-sa
Commercial Press, 1940
Buku Referensi
edited by Robert Payne
New American Library, 1947
Buku Teks
edited by Song Zhenghai
Zhejiang Jiaoyu Chubanshe, 2000
Buku Referensi
Han, Qi, 1963-, author
Hebei ren min chu ban she, 1999
Buku Teks
International Labour Organization
International Labour Organization, 1994
Buku Teks