Collars, C., Lee, K. P., Hoe, L. N., & Seng, T. C. (2003). Shaping maths: Activity book. Federal Publications.
Lua i Stíl Chicago (17ú heag.)Collars, Charlotte, Koay Phong Lee, Lee Ngan Hoe, agus Tan Cheow Seng. Shaping Maths: Activity Book. Singapore: Federal Publications, 2003.
Lua MLA (8ú heag.)Collars, Charlotte, et al. Shaping Maths: Activity Book. Federal Publications, 2003.
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