Please download the attachment. Foreign language documents about The West Chamber and Yuan Zaju have been compressed and uploaded to the annexes. I hope it will be helpful to your research. It's not easy to find, but I hope it can be adopted. The quotation reference format is as follows:

[1] Edwards e. The West Chamber (The West Chamber). A China drama, translated by Sixiong. Introduction by Gordon Bottomley, page xxiii+ 28 1. London: Metthuen, 1935. 8s。 6d[J]。 Bulletin of the Institute of Oriental and African Studies,1937,8 (04):1132-132.

[2] Chen H. On Yuan Zaju and Buddhism [J]. Frontier of China Literature Research, 2007, 1(3): 4 10-430.