A similar pair of cups in the Percival David Foundation is illustrated in Sekai toji zenshu, vol. 15, Japan, 1983, p. 203, no. 292, and another pair by R. Krahl, Chinese Ceramics from the Meiyintang Collection, vol. 2, London, 1994, p. 240, no. 908. One from a pair in the Baur Collection is illustrated with a matching saucer by J. Ayers in The Baur Collection, vol. III, Geneva, 1972, nos. A 489-492. See, also, a similar Yongzheng-marked cup illustrated by Peter Lam in Shimmering Colours, Monochromes of the Yuan to Qing Periods, The Zhu Yue Tang Collection, Art Museum, the Chinese University of Hong Kong, 2005, 209, no. 133. A set of five similar Yongzheng-marked cups is illustrated in Imperial Perfection: The Palace Porcelain of Three Chinese Emperors, Kangxi - Yongzheng - Qianlong, A Selection of Porcelain from the Wang Xing Lou Collection, Hong Kong, 2004, pp. 246-47, no. 98.