Integrated Chinese Level 1 part 1, Character book, Third edition. Third Edition Yao, T.-C. (2008), Boston: Cheng & Tsui, 142.
Integrated Chinese Level 1 Part 1, Work Book, Third edition. Third Edition Liu, Y., Yao, T.-C., Bi, N.-P., Shi, Y. & Ge, L. (2008), Boston: Cheng & Tsui, 192.
