Leng, H. P., & Khang, G. N. (2003). I-Science: Workbook. SNP Panpac.
Lua i Stíl Chicago (17ú heag.)Leng, Ho Peck, agus Goh Ngoh Khang. I-Science: Workbook. Singapore: SNP Panpac, 2003.
Lua MLA (8ú heag.)Leng, Ho Peck, agus Goh Ngoh Khang. I-Science: Workbook. SNP Panpac, 2003.
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