Zhang, Stacy Guoying. “A Symbol in Mass Production: Ruyi Images in the Inner and Outer Cities Under the Qianlong Reign”. FORUM: University of Edinburgh Postgraduate Journal of Culture & the Arts, no. 15 (December 12, 2012): 1 - 10. Accessed October 19, 2019. http://www.forumjournal.org/article/view/534.