Scott Minick and Jiao Ping: Chinese Graphic Design in the 20th Century (London: Thanmes and Hudson, 1990), page advertisement from Jinan Liu’s Fine Needle Shop, Shandong Province, Song Dynasty

Zhongguo lishi bowu guan, ed., Zhongguo godai shi cankao tulu: Song Yuan shiqi (Shanghai: Shanghai jiaoyu chubanshe, 1991), p. 109.