backstamps by chinese artists and workshops

Christie’s
Specialist Kate Hunt, Director, Chinese Ceramics and Works of Art, Christie’s London, offers an extensive guide to reign marks /
English language
https://www.christies.com/features/Reign-marks-on-Chinese-ceramics-An-expert-guide-8248-1.aspx

GOTHEBORG.COM (Sweden)
Antique Chinese porcelain collector’s free help and info page, marks… /
English language
www.gotheborg.com/