1. Exit and Entry Administration Law of the People's Republic of China (Presidential Decree No. 57 of the People's Republic of China)
Source: Central People's Government of the People's Republic of China
http://www.gov.cn/flfg/2012-06/30/content_2174944.htm
China Consular Service Network (in Chinese and English)
http://cs.mfa.gov.cn/zlbg/flfg/crjxg/t1054650.shtml

2. Regulations on the Administration of the Entry and Exit of Foreigners in the People's Republic of China (Order No. 637 of the State Council of the People's Republic of China)
Source: Central People's Government of the People's Republic of China