From: Beijing Gu Jianzhu, Jianzhu Gongchengbu Jianzhu kexue yanjiu yuan and Jianzhu Lilun ji lishi yanjiu zhubian. (Beijing: Wen Wun Chubanshe, 1959). plate 139.
Siheyuan overhead view, black and white.
Scanned August 12, 1998. 300 dpi, artprint. On UMAX Powerlook II.