Primalani, V., Leng, C. M., Quek, K., & Meng, S. K. (2003). In step maths: Workbook. SNP Panpac.
Lua i Stíl Chicago (17ú heag.)Primalani, Varsha, Chan Mei Leng, Karen Quek, agus Sin Kwai Meng. In Step Maths: Workbook. Singapore: SNP Panpac, 2003.
Lua MLA (8ú heag.)Primalani, Varsha, et al. In Step Maths: Workbook. SNP Panpac, 2003.
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